_Diastoma_, _417_
_Diaulula_, _434_
_Dibaphus_, _425_
Dibranchiata, _380_;
eye, 183;
nervous system, 207
_Diceras_, 269, _455_
_Didaena_, =12=, 297, _455_
Differences of sex, 133
_Dignomia_, 511
Digonopora, 134, 144
_Diloma_, _408_
_Dimorphoptychia_, _410_
_Dimya_, _450_
_Dinobolus_, _504_, 508
_Dinoplax_, _403_
Ditocardia, 9, 170, _405_ f.
_Diplodonta_, _452_
_Diplommatina_, 302–327, _413_
_Diplomphalus_, 322, 323, _440_
_Diplopoma_, 346, 351, _414_
_Dipsaccus_, _424_
_Dipsas_, 307
_Discina_, 464, 468, 471, 475, _487_;
distribution, 485;
fossil, 493, _504_;
stratigraphical distribution, 506, 508
Discinidae, _487_, 496, _504_, 508, 511
_Discinisca_, _487_, 510;
distribution, 485, 486
_Discites_, _395_
_Discodoris_, _434_
_Discosorus_, _394_
_Distortio_, 255--see _Persona_
_Ditropis_, 312, 314, _414_
Docoglossa, 227, _405_
_Dolabella_, =428=, _431_
_Dolabrifer_, _431_
_Dolium_, _419_;
acid secretion, 237
_Donax_, 269, 446, _453_
_Dondersia_, _404_
_Dorcasia_, 333, _441_
_Doridium_, _430_
_Doridunculus_, _434_;
radula, 229
_Doriopsis_, _434_
_Doris_, breathing organs, =159=;
radula, 230
_Dorsanum_, _423_
_Dosidicus_, _390_
_Dosinia_, _454_
_Doto_, _433_;
protective coloration, 71
_Dreissensia_, =14=, 123, _452_;
hibernation, 26;
singular habitat, 48;
veliger, =132=, 146;
eyes, 192
_Dreissensiomya_, _452_
_Drepania_, _434_
_Drillia_, _426_
_Drymaeus_, 356, _442_
_Dryptus_, 356, _441_
_Durgella_, 301, 304, _440_
Dwarf varieties, 88
_Dybowskia_, 290
_Eastonia_, _454_
_Eburna_, =267=, _424_;
radula, =220=
Ecardines, 466;
muscles, 476;
fossil, 493;
families, _487_, _503_, 508
_Eccyliomphalus_, _413_
_Echinospira_, 133
_Edentulina_, 338
Egg-laying of _Arion_, =42= f.;
of Mollusca generally, 123
_Eglisia_, _411_
Eider-duck, shells used by, 102
_Elaea_, 322, _440_
_Elasmoneura_, _411_
_Eledone_, =385=, _385_;
radula, 236
_Elizia_, _456_
_Elysia_, _432_;
protective coloration, 73;
breathing, 152;
radula, 217, =230=, =432=
_Emarginula_, =265=, _406_
_Embletonia_, 429
_Emmericia_, _415_
_Ena_, 296, _442_
_Enaeta_, _425_
_Endoceras_, _394_
_Endodonta_, 325, 334, _441_
_Engina_, _424_
_Enida_, _408_
_Ennea_, 298, 302, 306, 309, 314, 316, 328–337, =440=, _440_;
habits, 54;
_E. bicolor_, 279
_Enoplochiton_, =403=, _403_
_Enoploteuthis_, _391_
_Ensis_, _457_
_Entocolax_, 77, 79, 152
_Entoconcha_, 77, 79, 152, 216
_Entovalva_, 77, 82
_Ephippodonta_, _453_;
commensal, =81=
_Epidromus_, _420_
Epiphragm, 26, 27 f.
Epipodia, 427
_Erato_, _419_
_Eremophila_, 294
_Ergaea_, =248=, _412_
_Erinna_, 327, _439_
Erosion, 276
_Ervilia_, _454_
_Erycina_, _453_
Escargotières, 119
_Estria_, 329, _440_
Estuarine species, 14
_Ethalia_, _409_
_Eucalodium_, 260, 353, _442_
_Euchelus_, _408_
_Euchrysallis_, _420_
_Eudioptus_, _442_
_Eudoxochiton_, _403_
_Euhadra_, 316, 318, _441_
Eulamellibranchiata, _451_;
gill, =166=, 167
_Eulima_, _422_;
parasitic, 77, =79=
_Eulimella_, 250, _422_
_Eulota_, 296, _441_
_Euomphalus_, 247, _413_
_Euplecta_, _440_
_Eupleura_, _423_
_Euplocamus_, _434_
_Eurybia_, _438_
_Eurycampta_, 346–351
_Eurycratera_, 349, 351, _441_
_Eurystoma_, 304
_Eurytus_, _442_
_Euthria_, _424_
Euthyneura, 203
_Eutrochatella_, 347–351, =348=, _410_
Exploring expeditions, 362
Eye in Mollusca, 181 f.
_Facelina_, _432_
_Fasciolaria_, _424_;
radula, =221=
_Fastigiella_, _416_
_Favorinus_, _432_
_Fenella_, _415_
Fertilised ovum, development, 130 f.
_Ferussacia_, 291, 293, 297 f., _442_
Fiji islanders, use of shells, 98
Filibranchiata, _448_;
gill, =166=
_Fiona_, _432_;
radula, 217
_Firoloida_, _421_
Fischer and Bouvier, on breathing of _Ampullaria_, 158
_Fischeria_, 15, 328, _453_
Fish devour Mollusca, 59
_Fissurella_, =265=, _406_;
breathing organs, =153=;
apical hole, 156;
nervous system, 204;
radula, 227;
growth, =261=
_Fissurellidaea_, _406_
_Fissuridea_, _406_
_Fissurisepta_, _406_
_Fistulana_, 262, _457_
_Flabellina_, _432_
_Fluminicola_, _415_
_Folinia_, _415_
Food of Mollusca, 30 f.;
Mollusca as food, 102 f.
Foot, 198;
in classification, 5
Forel, on deep-water _Limnaea_, 162
Formation of shell, 255
_Fortisia_, _429_
_Fossarina_, _413_
_Fossarulus_, 302, _415_
_Fossarus_, _413_
Fourth orifice in mantle, 174
Fresh-water species living in sea, 12;
frozen hard, 24
Frogs and toads devour Mollusca, 58
_Fruticicola_, 285, 290, 316, 318, _441_
_Fruticocampylaea_, 296
_Fryeria_, _434_
_Fulgur_, =249=, _424_
_Fusispira_, _420_
_Fusus_, 262, _424_
_Gadinia_, =152=, _431_;
breathing, 18, 151;
classification, 19;
radula, 217, =230=
Gain, W. A., quoted, 32, 33, 39;
on taste of Mollusca, 179
_Galatea_, 15, 328, 336, _453_
_Galeomma_, 175, _453_
_Galerus_, =248=, _412_;
egg-capsules, 125
Garstang, W., on protective and warning coloration, 73
Gaskoin, on tenacity of life, 38;
on egg-laying, 42
Gassies, on hybrid union in snails, 130
Gasteropoda, on classification, 8, 11, 400 f.
_Gastrana_, _453_
_Gastrochaena_, _457_;
habits, 64
_Gastrodonta_, _440_
_Gastropteron_, 245, _430_
_Gaza_, 376, _408_
_Gena_, 246, _408_
_Genea_, _424_
_Genotia_, _426_
_Geomalacus_, =160=, 288, 291, _441_;
protective coloration, 70
_Geomelania_, 16, 348, 351, _414_
_Georgia_, 331, _414_
_Georissa_, 318, _410_
_Geostilbia_, 338, _442_
_Gerontia_, _441_
_Gerstfeldtia_, 290
_Gibbula_, _408_
_Gibbus_, 328–=338=, =440=, _440_
_Gillia_, _415_
Gills--_see_ Branchiae
_Girasia_, 301, 304, _440_
_Glandina_, =54=, =178=, 278, 292 f., 339–355, _440_;
radula, 231, =232=;
habits, 53
Glands, germ, 134, 140;
nidamental, 136
_Glassia_, 501, _505_
_Glaucomya_, 320, _454_
_Glaucus_, 429, _432_
_Gleba_, _437_
_Glessula_, 301, 309, 310, 333, _442_
Glochidium, =147=
_Glomus_, _448_
_Glossoceras_, _394_
Glossophora, 7
_Glottidia_, distribution, 485, _487_
_Glycimeris_, _457_
_Glyphis_, _406_
_Glyptostoma_, 341, _441_
_Gomphoceras_, _394_, =395=
_Gonatus_, _391_
_Goniatites_, _397_, =398=
_Goniobasis_, 341, _417_
_Goniodoris_, _434_;
protective coloration, 73;
radula, 229
_Goniomya_, _458_
_Gonostoma_, 291, 316, _441_
_Goniostomus_, _442_
_Grammysia_, _459_
_Grateloupia_, _454_
Great _Eastern_ and mussels, 116
Greenhouses, slugs in, 35
Green oysters, 108
_Gresslya_, _458_
Growth of shell, 40, 257
_Guesteria_, _440_
_Guildfordia_, _409_
_Guivillea_, 186, 376, _425_
Gulls and Mollusca, 56
_Gundlachia_, 19, 325, 345, 352, 359, _439_
Gymnoglossa, 216, 225, _422_
Gymnosomata, _437_
_Gyroceras_, 247, _395_
_Gyrotoma_, _417_
_Hadra_, 306, 315, 319–325, =322=, _441_
_Hadriania_, _423_
Haemoglobin, 171
_Hainesia_, 336, _414_
_Halia_, 366, _426_
_Haliotinella_, _431_
_Haliotis_, =266=, _407_;
and coyote, 57;
holes of, 156;
osphradium, 195;
epipodium, 199;
nervous system, 204;
radula, 215, 226
_Halopsyche_, 159, =438=, _438_
_Haminea_, =428=, _430_;
protective coloration, 73
_Hamites_, _399_
_Hamulina_, _399_
_Hanleyia_, _403_
_Hapalus_, 331, _442_
_Harpa_, radula, _425_, 216, 221;
self-mutilation, 45
_Harpagodes_, _418_
_Harpoceras_, _399_
_Harvella_, _454_
Hatching of eggs, 43
Hazay, on duration of life, 39;
on variation in _Limnaea_, 93
Hearing powers of Mollusca, 196
Heart, in classification, 9;
action during hibernation, 26;
and branchiae, =169=
Hectocotylus arm, 137 f.
_Helcion_, _405_;
protective coloration, 69
_Helcioniscus_, _405_
Hele, F. M., on _Hyalinia_, 33;
on _Stenogyra_, 34
_Helicarion_, 309, 316, 325, 332, _440_;
radula, 232;
habits, 45, 67
Helicidae, radula, 232, =234=
_Helicina_, 305, 306, 316–327, 338–358, _410_;
origin, =21=;
exterminated by cold, 24
_Helicophanta_, 335, =336=, =441=, _441_
_Heligmus_, _449_
_Helix_, _441_;
toothed aperture, 63;
protective coloration, 70;
variation, 87;
carbonic acid, 163;
eye, =181=, =183=;
food, 179;
smell, 194;
jaw, =211=;
distribution, 285;
tenacity of life, 37;
breeding, 129
_Helix alternata_, =340=;
_angulata_, =350=;
_aperta_, 38, 39, 51, =293=;
_arbustorum_, bathing, 23;
_caperata_, variation, 89;
_cereolus_, =340=;
_cicatricosa_, =316=;
_crenilabris_, 45;
_delphinuloides_, =297=;
_desertorum_, 37, 38, 70, 294;
_fidelis_, =341=;
_haemastoma_, habits, 70;
_harpa_, 287;
_hortensis_, =10=, 279;
pulsations, 26;
epiphragm, 28;
rock-boring, 49;
dart, =143=;
_imperator_, =347=;
habits, 45;
_laciniosa_, =297=;
_lactea_, 25, 38, 42, 279;
_lima_, =350=;
_muscarum_, =347=;
_nemoralis_, 38, =180=;
_niciensis_, =292=;
_nux denticulata_, =350=;
_palliata_, =340=;
_pisana_, 25;
habits, 33;
_pomatia_, 25, 34, 40;
eye, =181=;
_pomum_, =322=;
_pulchella_, 279;
_richmondiana_, =322=;
_rosacea_, =259=;
_rostrata_, =347=;
_rota_, =314=;
_rufescens_, pulsations, 26;
_similaris_, 279;
_souverbiana_, =336=, =441=;
_strigata_, =293=;
_tristis_, habits, 49;
_turricula_, =297=;
_Veatchii_, 38;
_Waltoni_, =304=;
_Wollastoni_, =297=;
_zonata_, =293=
_Helix aspersa_, homing, 35;
smell, 36;
duration of life, 39;
growth, 40;
strength, 45;
boring rock, 50;
variation, 87, 89;
eaten, 119;
hybrid union, 130;
generative organs, 140 f., =141=;
dart-sac, =143=;
pulmonary chamber, 160;
radula, 217;
alimentary canal, =237=;
monstrosities, 251, =252=;
growth, 258;
distribution, 279, 289
_Hemiarthrum_, _403_
_Hemicardium_, _455_
_Hemidonax_, _453_
_Hemifusus_, _424_
_Hemipecten_, _450_
_Hemiplecta_, 310, 316, 319, 321, _440_
_Hemisepius_, _389_
_Hemisinus_, 357, _417_
_Hemitoma_, =265=
_Hemitrichia_, 314
_Hemitrochus_, 346–351, _441_
_Hemphillia_, 245, 341, _441_
_Hercoceras_, _395_
Herdman, Prof. W. A., on cerata of Nudibranchs, 71 f.;
experiments on taste of Nudibranchs, 72;
on _Littorina rudis_, 151 n.
_Hermaea_, _432_;
protective coloration, 73
Hermaphrodite Mollusca, 134, 140, 145
Hermit-crabs, shells used by, 102
_Hero_, _432_
_Heterocardia_, _454_
_Heterodiceras_, _455_
Heteropoda, 9, _420_ f.;
radula, 228;
foot, 200
_Heudeia_, 316, _410_
_Hexabranchus_, _434_
Hibernation, 25, 163
High altitudes, Mollusca living at, 24
_Himella_, 15
_Hindsia_, _424_
_Hindsiella_, _453_
Hinge area, 493, 498
Hinge, in bivalves, 272
_Hinnites_, 257, _450_
_Hipponyx_, 248, _412_
_Hippopus_, _455_
_Hippurites_, =455=, _456_
_Histiopsis_, _391_
_Histioteuthis_, _391_
_Holcostoma_, _417_
_Holohepatica_, _433_
_Holopella_, _411_
_Holospira_, 339, 353, _442_
Holostomata, 156
_Homalogyra_, _413_;
radula, 223
_Homalonyx_, 245, =343=-358, _443_
Homing powers of Mollusca, 34
_Homorus_, 330–337, _443_
_Hoplites_, _399_
_Hoplopteron_, _422_
_Horea_, 332
_Horiostoma_, _409_
Hot springs, Mollusca living in, 25
_Huronia_, _394_
_Hyalaea_, =10=, _436_
_Hyalimax_, 245, 305, 306, 338, _443_
Hyaline stylet, 240
_Hyalinia_, _440_;
pulsations, 26;
food, 33;
smell, 194;
dart, =143=;
radula, 232, =234=;
distribution, 287 f., 318, 340–357;
_H. alliaria_, 279;
smell, 194;
_cellaria_, 279;
_Draparnaldi_, 33
_Hyalocylix_, _437_
_Hyalosagda_, 352
_Hybocystis_, =305=, 309, _414_
Hybridism, 129
_Hydatina_, _430_;
radula, =231=
_Hydrobia_, 325, 332, _415_;
_H. ulvae_, egg-laying, 128
_Hydrocena_, 298, _410_;
radula, 226
Hymenoptera build in dead shells, 102
_Hypobranchaea_, _434_;
radula, 230
_Hypotrema_, _448_
_Hypselostoma_, 248, =302=, 305, 314, _442_
_Hyria_, 344, _452_
_Hystricella_, 297
_Ianthina_, 360, =126=, _411_;
egg-capsules, 125;
eyes, 186;
radula, =224=
_Iapetella_, _385_
_Iberus_, 285–=293=, =297=, _441_
_Ichthyosarcolites_, _456_
_Idalia_, =179=, 429, _434_;
radula, 229, 230
_Idas_, _449_
_Idiosepion_, _389_
_Illex_, _390_
_Imbricaria_, _425_;
radula, =221=
_Imperator_, _409_
Indians of America, use of shells, 100
_Infundibulum_, _408_
_Inioteuthis_, _389_
Ink-sac, =241=
_Inoceramus_, _449_
Insects eaten by Mollusca, 32
_Insularia_, 319, 320
Intestine, 241
_Io_, =16=, 340, _417_
_Iopas_, _423_
_Iphigenia_, 15, _453_
_Iravadia_, 305, _415_
_Iridina_, 294
_Irus_, 297
_Isanda_, _409_
_Ischnochiton_, _403_
_Isidora_, 298, 320–327, 333, 336, 359, _439_
_Ismenia_, _404_
_Isocardia_, 269, =451=, _451_
_Isodonta_, _453_
_Isomeria_, 343, 356, _441_
_Issa_, _434_
_Jamaicia_, _414_
_Janella_, =161=, _443_;
pulmonary orifice, =161=
Janellidae, radula, 234;
distribution, 321–326
_Janus_, _432_
_Japonia_, 318
Jaws, 210
_Jeanerettia_, 346–351, _441_
Jeffreys, Dr., on _Limnaea_, 34;
on _Neptunea_, 193
_Jeffreysia_, _415_;
radula, 223
_Jorunna_, protective coloration, 73
_Jouannettia_, _457_
_Jullienia_, 307, _415_
_Jumala_, _424_
_Kaliella_, 301, 304, 310, 314–317, 335, _440_
_Kalinga_, _434_
Kashmir, land Mollusca, 280
_Katherina_, _403_
_Kelletia_, _424_
_Kellia_, _453_
_Kellyella_, _452_
Kidneys, 242
King, R. L., on smell in bivalves, 195
_Kingena_, _506_, 508
Kitchen-middens, 104
_Koninckella_, _505_;
stratigraphical distribution, 507, 508
_Koninckina_, _505_;
stratigraphical distribution, 507, 508
Koninckinidae, 501, _505_, 508
_Kutorgina_, _504_;
stratigraphical distribution, 506, 508;
embryonic shell, 509
Labial palps, 210
_Labyrinthus_, 342, 353–357, _441_;
aperture, =63=
Lacaze-Duthiers on _Testacella_, 52 f.;
on smell in _Helix_, 194
_Lacuna_, _413_
_Lacunopsis_, 332
_Lagena_, _424_
_Lagochilus_, 309, 316–319, _414_
_Lamellaria_, 245, _411_;
habits and protective coloration, 74;
parasitic, 78;
radula, 223
_Lamellidoris_, _434_;
radula, 229, 230, =231=
_Lampania_, _417_
Land Mollusca, origin, 11 f.
_Lanistes_, 249, 294, 328, 331, _416_
Lankester, Prof. E. Ray, on shell-gland, 132;
on haemoglobin, 171
_Lantzia_, 278, 338, _439_
_Laoma_, _441_
_Larina_, 302, _417_
Larvae of Pelecypoda, 7;
of insects resembling Mollusca, 67 f.
_Lasaea_, _453_
_Latia_, 19, 326, _439_
_Latiaxis_, _423_
_Latirus_, _424_
Latter, O. H., on _Glochidium_, 147
Layard, E. L., on self-burying Mollusca, 41;
on sudden appearance of _Stenogyra_, 47;
on _Coeliaxis_, 49;
on _Rhytida_ and _Aerope_, 54
_Leda_, _447_
_Leia_, 348–351, _442_
_Leila_, 344, _452_
_Leonia_, _414_
_Lepeta_, _405_
_Lepetella_, _405_
Lepetidae, radula, 227
_Lepidomenia_, _404_;
radula, 229
_Leptachatina_, 327
_Leptaena_, 500, 501, 502, =503=, _505_;
stratigraphical distribution, 507, 508
_Leptaxis_, _441_
_Leptinaria_, 357, 358, _442_
_Leptochiton_, _403_
_Leptoconchus_, 75, _423_
_Leptoloma_, 348, 351
_Lepton_, _453_;
parasitic, 77;
commensal, 80;
mantle-edge, 175, 178
_Leptoplax_, _403_
_Leptopoma_, 316, 319, 338, _414_
_Leptoteuthis_, _390_
_Leptothyra_, _409_
_Leroya_, 331
_Leucochila_, _442_
_Leucochloridium_, =61=
_Leucochroa_, =292=, 295, _441_
_Leuconia_, _439_
_Leucotaenia_, 335, 359, _441_
_Leucozonia_, 64, =424=, _424_
_Levantina_, 295
_Libania_, 295
_Libera_, 327, _441_;
egg-laying, 128
_Libitina_, _451_
_Licina_, _414_
Life, duration of, in snails, 39
Ligament, 271
_Liguus_, 349, 351, _442_
_Lima_, 178, =179=, _450_;
habits, 63
Limacidae, radula, 232
_Limacina_, 59, 249, =436=, _436_
_Limapontia_, 429, _432_;
breathing, 152
_Limax_, 245, _440_;
food, 31, 179;
variation, 86;
pulmonary orifice, 160;
shell, 175;
jaw, =211=;
radula, 217;
distribution, 285, 324;
_L. agrestis_, eats May flies, 31;
_arborum_, slime, 30;
food, 31;
_flavus_, food, 33, 36;
habits, 35, 36;
_gagates_, 279, 358;
_maximus_, =32=, =161=;
eats raw beef, 32;
cannibalism, 32;
sexual union, 128;
smell, 193 f.
_Limea_, _450_
_Limicolaria_, 329–332, _443_
_Limnaea_, _439_;
self-impregnation, 44;
development and variation, 84, 92, 93;
size affected by volume of water, 94;
eggs, 124;
sexual union, 134;
jaw, 211;
radula, 217, =235=;
_L. auricularia_, 24;
_glutinosa_, sudden appearance, 46;
_Hookeri_, 25;
_involuta_, 82, 278, 287;
_peregra_, =10=, =180=;
burial, 27;
food, 34, 37;
variation, =85=;
distribution, 282;
_palustris_, distribution, 282;
_stagnalis_, food, 34, 37;
variation, =85=, =95=;
circum-oral lobes, 131;
generative organs, =414=;
breathing, 161;
nervous system, =204=;
distribution, 282;
_truncatula_, parasite, 61;
distribution, 282
_Limnocardium_, _455_
_Limnotrochus_, 332, _415_
_Limopsis_, _448_
Limpet-shaped shells, 244
Limpets as food for birds, 56;
rats, 57;
birds and rats caught by, 57;
as bait, 118
_Lingula_, 464, 467, 468, 471, =472=, 473, 475, 477, 478, _487_;
habits, =483=, 484;
distribution, 485;
fossil, 493, =494=, _503_;
stratigraphical distribution, 506, 508, 510, 511
_Lingulella_, 493, _503_;
stratigraphical distribution, 506, 508, 511
_Lingulepis_, _503_, 511
Lingulidae, 485, 487, 496, _503_, 508
_Linnarssonia_, _504_;
stratigraphical distribution, 506, 508
_Lintricula_, _426_
_Liobaikalia_, 290
_Liomesus_, _424_
_Lioplax_, 340, _416_
_Liostoma_, _424_
_Liostracus_, _442_
_Liotia_, _408_
_Liparus_, 324, 359, _441_
_Lissoceras_, _399_
_Lithasia_, 340, _417_
_Lithidion_, _414_
_Lithocardium_, _455_
_Lithodomus_, _449_
_Lithoglyphus_, 294, 296, 297, _415_
_Lithopoma_, _409_
_Lithotis_, 302, _443_
_Litiopa_, 30, 361, _415_
_Littorina_, _413_;
living out of water, 20;
radula, =20=, 215;
habits, 50;
protective coloration, 69;
egg-laying, 126;
hybrid union, 130;
monstrosity, =251=, =252=;
operculum, =269=;
erosion, 276;
_L. littorea_, in America, 374;
_obtusata_, generative organs, =135=;
_rudis_, 150;
Prof. Herdman’s experiments on, 151 n.
_Littorinida_, _415_
_Lituites_, 247, _395_
Liver, 239;
liver-fluke, 61
_Livinhacea_, 333, 359, _441_
_Livona_, _408_;
radula, 226;
operculum, =268=
Lloyd, W. A., on _Nassa_, 193
_Lobiger_, _432_
_Lobites_, _397_
_Loligo_, 378–_389_;
glands, 136;
modified arm, 139;
eye, =183=;
radula, 236;
club, =381=;
_L. punctata_, egg-laying, 127;
_vulgaris_, larva, 133
_Loligopsis_, _391_
_Loliguncula_, _390_
_Loliolus_, _390_
_Lomanotus_, _433_
_Lophocercus_, _432_
_Lorica_, _403_
Lowe, E. J., on growth of shell, 40
_Loxonema_, _417_
_Lucapina_, _406_
_Lucapinella_, _406_
_Lucerna_, _441_
_Lucidella_, 348–351, _410_
_Lucina_, =270=, _452_
_Lucinopsis_, _454_
Lung, 151, 160
_Lunulicardium_, _455_
_Lutetia_, _452_
_Lutraria_, 446, _456_
_Lychnus_, _442_
_Lyonsia_, _458_
_Lyonsiella_, _458_;
branchiae, 168
_Lyra_, stratigraphical distribution, 507
_Lyria_, _425_
_Lyrodesma_, _447_
_Lysinoe_, _441_
_Lytoceras_, _398_
_Maackia_, 290
_Macgillivrayia_, 133
_Machomya_, _458_
_Maclurea_, _410_
_Macroceramus_, 343–353, _442_
_Macroceras_, _440_
_Macrochilus_, _417_
_Macrochlamys_, 296, 299, 301 f., 310, 316–322, _440_
_Macrocyclis_, 358, =359=, _442_
_Macron_, _424_
_Macroön_, _441_
_Macroscaphites_, 247, =399=, _399_
_Macroschisma_, =265=, _406_
_Mactra_, 271, 446, _454_
_Macularia_, 285, 291, =292= f., _441_
_Magas_, _506_;
stratigraphical distribution, 507, 508
_Magellania_, 500
_Magilus_, =75=, _423_
_Mainwaringia_, 302
_Malaptera_, _418_
_Malea_, _419_
_Malletia_, _447_
_Malleus_, _449_
_Mangilia_, _426_
Mantle, 172 f., =173=;
lobes of, 177
_Margarita_, _408_;
radula, =225=
_Marginella_, _425_;
radula, 221
_Mariaella_, 314, 338, _440_
_Marionia_, _433_
_Marmorostoma_, _409_
Marrat, F. P., views on variation, 82
_Marsenia_, 133
_Marsenina_, _411_
_Martesia_, 305, _457_
_Mastigoteuthis_, _390_
_Mastus_, 296, _442_
_Matheronia_, _455_
_Mathilda_, 250, _417_
_Maugeria_, =403=
_Mazzalina_, _424_
_Megalatractus_, _424_
Megalodontidae, _451_
_Megalomastoma_, 344, _414_
_Megalomphalus_, _416_
_Megaspira_, 358, _442_
_Megatebennus_, _406_
_Megerlia_, distribution, 486, _487_
_Meladomus_, 249, 328, 331, _416_
_Melampus_, =18=, 199, 250, =439=, _439_
_Melanatria_, 336
_Melania_, =276=, =417=, _417_;
distribution, 285, 292 f., 316 f., 324, 336
_Melaniella_, _442_
Melaniidae, origin, 17
Melanism in Mollusca, 85
_Melanopsis_, _417_;
distribution, 285, 291, 292 f., 323, 326
_Melantho_, 340, _416_
_Melapium_, _424_
_Meleagrina_, _449_
_Melia_, 348
_Melibe_, _432_
_Melongena_, _424_;
radula, =220=;
stomach, =238=
_Merica_, _426_
_Merista_, _505_, 508
_Meroe_, _454_
_Merope_, 327
_Mesalia_, _417_
_Mesembrinus_, 356, _442_
_Mesodesma_, _454_
_Mesodon_, =340=, _441_
_Mesomphix_, 340, _440_
_Mesorhytis_, 377
_Meta_, _423_
_Metula_, _424_
_Meyeria_, _424_
_Miamira_, _434_
_Microcystis_, 323, 324, 327, 338, _440_
_Microgaza_, _408_
_Micromelania_, 12, 297
_Microphysa_, protective habits, 70
_Microplax_, _403_
_Micropyrgus_, _415_
_Microvoluta_, _425_
_Middendorffia_, _403_
_Milneria_, _451_
Mimicry, 66
_Minolia_, _408_
_Mitra_, _425_;
radula, 221
_Mitrella_, _423_
_Mitreola_, _425_
_Mitrularia_, =248=, _412_
_Modiola_, 446, _449_;
habits, 64;
genital orifice, 242
_Modiolarca_, _449_
_Modiolaria_, _449_;
habits, 78
_Modiolopsis_, _452_
_Modulus_, _417_
_Monilia_, _408_
Monkey devouring oysters, 59
_Monoceros_, _423_
_Monocondylaea_, _452_
_Monodacna_, 12, 297, _455_
_Monodonta_, _408_, =408=;
tentaculae, =178=
_Monogonopora_, 134, 140
_Monomerella_, 496, _504_
_Monopleura_, _456_
_Monotis_, _449_
Monotocardia, 9, 170, _411_
Monstrosities, 250
_Montacuta_, _452_;
_M. ferruginosa_, commensal, 80;
_substriata_, parasitic, 77
_Mopalia_, _403_
Moquin-Tandon, on breathing of Limnaeidae, 162;
on smell, 193 f.
_Moreletia_, _440_
_Morio_, _420_
_Mormus_, 356, _442_
Moseley, H. N., on eyes of _Chiton_, 187 f.
_Moussonia_, 327
Mouth, 209
_Mucronalia_, _422_
Mucus, use of, 63
_Mulinia_, =272=
_Mülleria_, 344, _452_
_Mumiola_, _422_
_Murchisonia_, 265, _407_
_Murchisoniella_, _422_
_Murex_, _423_;
attacks _Arca_, 60;
use of spines, 64;
egg-capsules, 124;
eye, =182=;
radula, =220=;
shell, =256=
Musical sounds, 50
Mussels, cultivation of, 115;
as bait, 116;
poisonous, 117;
on _Great Eastern_, 116
_Mutela_, 294, 328, 331, 336, _452_
_Mutyca_, _425_
_Mya_, 271, 275, =446=, _456_;
stylet, 240;
_M. arenaria_, variation, 84
Myacea, _456_
_Myalina_, _449_
_Mycetopus_, 307, 316, 344, _452_
_Myochama_, =458=
_Myodora_, _458_
_Myophoria_, _448_
Myopsidae, _389_
_Myrina_, _449_
_Myristica_, _424_
Mytilacea, _448_
_Mytilimeria_, _458_
_Mytilops_, _452_
_Mytilopsis_, 14
_Mytilus_, 258, _449_;
gill filaments, =166=, 285;
_M. edulis_, =14=, =165=;
attached to crabs, 48, 78;
pierced by _Purpura_, =60=;
Bideford Bridge and, 117;
rate of growth, 258;
stylet, 240
_Myxostoma_, _414_
_Nacella_, _405_
_Naiadina_, _449_
_Nanina_, 278, 300 f., 335, _440_;
radula, 217, 232
_Napaeus_, 296–299, 316, _442_
_Naranio_, _454_
_Narica_, _412_
_Nassa_, _423_;
egg-capsules, =126=;
sense of smell, 193
_Nassodonta_, _423_
_Nassopsis_, 332
_Natica_, =246=, 263, _411_;
spawn, =126=;
operculum, =268=
_Naticopsis_, _409_
‘Native’ oysters, 106
_Nausitora_, 15
Nautiloidea, _393_
_Nautilus_, 254, =392=, _395_;
modified arms, 140;
eye, =183=;
nervous system, 206;
radula, 236;
kidneys, 242
_Navicella_, 267, 268, 324, 327, _410_;
origin, =17=
_Navicula_, =358=, _442_
_Navicula_ (Diatom), cause of greening in oysters, 108
_Nectoteuthis_, _389_
_Neda_, _431_
_Nematurella_, 12, 297
_Nembrotha_, _434_
_Neobolus_, _504_
_Neobuccinum_, _424_
_Neocyclotus_, 357, 358
_Neomenia_, =8=, 133, 216, 228, =404=, _404_;
breathing organs, =154=;
nervous system, =203=
_Neothauma_, 332
Neotremata, 511
_Neptunea_, 252, 262, _423_;
egg-capsules, =126=;
capture, 193;
monstrosity, =251=
_Nerinea_, _417_
_Nerita_, =17=, _410_;
_N. polita_ used as money, 97
Neritidae, 260, _410_;
radula, =226=
_Neritina_, =256=, _410_;
origin, 16, =17=, =21=;
egg-laying, 128;
eye, 181;
distribution, 285, 291 f., 324, 327;
_N. fluviatilis_, habitat, 12, 25
_Neritoma_, _410_
_Neritopsis_, _409_;
radula, 226;
operculum, =269=
Nervous system, 201 f.
_Nesiotis_, 357, _442_
New Zealanders, use of shells, 99
_Nicida_, _413_
_Ninella_, _409_
_Niphonia_, _408_
_Niso_, _422_
_Nitidella_, _423_
_Nodulus_, _415_
_Notarchus_, _431_
_Nothus_, 358, _442_
_Notobranchaea_, _438_
_Notodoris_, _434_
_Notoplax_, _403_
_Novaculina_, 305
_Nucula_, 254, 269, =273=, _447_
Nuculidae, otocyst, 197;
foot, 201
_Nuculina_, _448_
Nudibranchiata, _432_;
defined, 10;
protective and warning colours, 71 f.;
breathing organs, 159
_Nummulina_, 295
_Nuttallina_, _403_
_Obba_, 311, 315, _441_
_Obbina_, 306, 311, 312, =314=, 319
_Obeliscus_, _442_
_Obolella_, 496, _504_;
stratigraphical distribution, 506, 508
Obolidae, 496, _504_, 508
_Obolus_, _504_, 508;
embryonic shell, 509
_Ocinebra_, _423_
Octopodidae, hectocotylised arm, 137, 139, =140=
_Octopus_, =379=-_386_;
egg-capsules, =127=;
vision, 184;
radula, =236=;
crop, 238
_Ocythoe_, _384_;
hectocotylus, =138=
_Odontomaria_, _407_
_Odontostomus_, =358=, =442=
_Odostomia_, 250, _422_;
parasitic, 78
Oesophagus, 237
_Ohola_, _434_
Oigopsidae, _390_
_Oldhamina_, _506_, 508
_Oleacina_, habits, 55
_Oliva_, =199=, =255=, 275, =425=, _426_
_Olivancillaria_, _426_
_Olivella_, 260, 267, _426_;
_O. biplicata_ as money, 97
_Olivia_, _408_
_Omalaxis_, _413_
_Omalonyx_, habitat, 23
_Ommastrephes_, =6=, 378, _390_
Ommatophores, 180, 187
_Omphalotropis_, 306, 309, 316, 324, 327, 338, _414_
_Onchidiella_, _443_
Onchidiidae, 245;
radula, 234;
anus, 241
_Onchidiopsis_, _411_
_Onchidium_, _443_;
breathing, 163;
eyes, 187
_Onchidoris_, radula, 230
_Oniscia_, _420_
_Onoba_, _415_
_Onychia_, _390_
_Onychoteuthis_, _390_;
club, =386=
_Oocorys_, _420_
_Oopelta_, 329, _440_
_Opeas_, _442_
Operculum, 267 f.
_Ophidioceras_, 247, _395_
_Ophileta_, _413_
_Opis_, _451_
Opisthobranchiata, _427_;
defined, 9;
warning, etc., colours, 71 f.;
generative organs, 144;
breathing organs, 158;
organs of touch, 178;
parapodia, 199;
nervous system, 203;
radula, 229
_Opisthoporus_, =266=, 300, 314–316, _414_
_Opisthostoma_, 248, =309=, _413_
_Oppelia_, _399_
_Orbicula_, =464=
Orbiculoidea, _504_, 510
Orders of Mollusca, 5–7
Organs of sense, 177
Origin of land Mollusca, 11 f.
_Ornithochiton_, _403_
_Orphnus_, 356, _441_
_Orpiella_, _440_
_Orthalicus_, 342–358, =355=, _442_;
habits, 27;
variation, 87;
jaw, =211=;
radula, 233, =234=
_Orthis_, _505_;
stratigraphical distribution, 506, 507, 511
_Orthoceras_, =394=, _394_
_Orthonota_, _457_
_Orthothetes_, _505_;
stratigraphical distribution, 507, 508
_Orygoceras_, 247
Osphradium, 194 f.
_Ostodes_, 327
_Ostracotheres_, 62
_Ostrea_, 252, 258, 446, _449_;
intestine, 241
_Otina_, 18, _439_
_Otoconcha_, 326, _440_
Otocysts, 196 f., =197=
_Otopleura_, _422_
_Otopoma_, 331, 338, _414_
_Otostomus_, 353, _442_
Ovary, 135
Ovoviviparous genera, 123
_Ovula_, _419_;
protective coloration, 70, 75;
radula, 80, 224;
used as money, 97
Ovum, development of fertilised, 130
_Oxychona_, 358
_Oxygyrus_, _422_;
foot, 200
_Oxynoe_, _432_;
radula, 230
Oyster-catchers, shells used by, 102
Oyster, cultivation, 104–109;
living out of water, 110;
enemies, 110 f.;
reproduction, 112 f.;
growth, 114;
cookery, 114;
poisonous oysters, 114;
vision, 190
_Pachnodus_, 329–335, _441_, _442_
_Pachybathron_, _425_
_Pachychilus_, _354_
_Pachydesma crassatelloides_, money made from, 97
Pachydomidae, _451_
_Pachydrobia_, 307, _415_
_Pachylabra_, _416_
_Pachyotus_, 334, =336=, =355=, 358, _441_
_Pachypoma_, _409_
_Pachystyla_, 337, _440_
_Pachytypus_, _451_
_Padollus_, _407_
Palaearctic region, 284 f.
_Palaeoneilo_, _447_
_Palaeosolen_, _457_
_Palaina_, 327, _413_
_Palio_, _434_
Pallial line and sinus, 270
_Pallifera_, 340, _440_
Palliobranchiata, 464
_Paludina_, _416_;
penis, 136;
eye, 181;
vision, 184;
_P. vivipara_, 24--see also _Vivipara_
_Paludomus_, 332, 336, 338, _417_
Panama, Mollusca of, 3
_Panda_, 322, 325, 335
_Pandora_, _458_
Papuans, use of shells, 99
_Papuina_, 309, 319–324, _441_
_Paramelania_, 332
_Paramenia_, _404_
Parasitic worms, 60 f.;
Mollusca, 74 f.
_Parastarte_, _451_
_Parkinsonia_, =398=
_Parmacella_, 245, 291, 294 f., 438 n., _440_;
radula, 232;
shell, 175
_Parmacochlea_, 322, 326, _440_
_Parmarion_, 309, _440_
_Parmella_, 326, _440_
_Parmophorus_, _406_
_Parthena_, 349–352, =350=, _441_
Parts of univalve shell, 262;
bivalve, 269
_Partula_, 319–327, =326=, _442_;
radula, 233
_Paryphanta_, 321, 325, _440_
_Paryphostoma_, _415_
_Passamaiella_, 332
_Patella_, _405_, 464;
as food, 56 f.;
eye, =182=;
radula, =214=, 215, =227=;
crop, 238;
anus, 241;
kidneys, 242;
shell, 262;
_P. vulgata_, veliger, =132=;
breathing organs, etc., 156, =157=
Patelliform shell in various genera, 19
_Paterina_, 509, 510, 511
_Patinella_, radula, 227
_Patula_, 297, 298, 318–338, =340=, _441_
_Paxillus_, _413_
Pearl oysters, 100
_Pecten_, 446, =450=, _450_;
organs of touch, 178;
ocelli, =191=;
flight, 192;
nervous system, =206=;
genital orifice, 242;
ligament, 271
_Pectinodonta_, _405_;
radula, 227
_Pectunculus_, _448_
_Pedicularia_, 75, _419_;
radula, 224
_Pedinogyra_, 319, 322, _442_
_Pedipes_, =18=, 199, =439=, _439_
_Pedum_, _450_
Pelagic Mollusca, 360
Pelecypoda, _7_, _445_;
development, 145;
generative organs, 145;
branchiae, =166–169=;
organs of touch, 178;
eyes, 189 f.;
foot, 201;
nervous system, 205
_Pella_, 333
_Pellicula_, 352, _442_
_Peltoceras_, _399_
_Pentadactylus_, _423_
_Peraclis_, _436_
_Pereiraea_, _418_
_Perideris_, 328–330, _443_
Periodicity in breeding, 129
_Periophthalmus_, 187
Periostracum, 275
_Periploma_, _459_
_Perisphinctes_, _399_
_Perissodonta_, _418_
_Perissolax_, _424_
_Peristernia_, _424_
_Perna_, _449_;
ligament, 271
_Pernostrea_, _449_
_Peronaeus_, 358, _442_
_Peronia_, _443_
_Perrieria_, 319, _442_
_Perrinia_, _408_
_Persicula_, _425_
_Persona_ (= _Distortio_), _420_
_Petenia_, 353, _440_
_Petersia_, _420_
_Petraeus_, 295, 331, _442_
_Petricola_, _454_
_Phacellopleura_, _403_
_Phanerophthalmus_, _430_
_Phaneta_, _408_
_Phania_, 312, _441_
_Pharella_, _457_
_Pharus_, _457_
Pharynx, 210
_Phasianella_, _409_
_Phasis_, 333
Phenomena of distribution, 362
_Philine_, 245, =428=, _430_;
protective coloration, 73;
radula, 229, 230
_Philomycus_, 245, 318, _440_
_Philonexis_, =138=
_Philopotamis_, 304, _417_
_Phoenicobius_, 315, _441_
Pholadacea, _457_
_Pholadidea_, _457_
_Pholadomya_, _459_
_Pholas_, 245, 274, 447, _457_;
in fresh water, 15
_Phos_, _424_
_Photinula_, _408_
Phragmophora, _386_
_Phyllidia_, _434_;
breathing organs, 159
_Phyllirrhoe_, 360, 428, _433_
_Phyllobranchus_, _432_
_Phylloceras_, =398=, _398_;
suture, =396=
_Phylloteuthis_, _390_
_Physa_, _439_;
aestivating out of water, 27;
spinning threads, 29;
sudden appearance, 46;
osphradium, 195;
nervous system, =205=;
radula, =235=;
_P. hypnorum_, 23, 27
_Pileolus_, _410_
_Pileopsis_, 76
_Piloceras_, _394_
_Pinaxia_, _423_
_Pineria_, _442_
_Pinna_, _449_;
shell, =254=
_Pinnoctopus_, _385_
_Pinnotheres_, 62
_Pinoceras_, _398_
_Pirena_, _417_
_Pirenella_, _416_
_Piropsis_, _424_
_Pirula_--see _Pyrula_
_Pisania_, _424_
_Pisidium_, _453_;
smell, 195;
ova, 146;
_P. pusillum_, distribution, 282
_Pitys_, 327
_Placobranchus_, _432_
_Placostylus_, 322, =323=-325, 359, _442_;
radula, 233
_Placuna_, _448_;
_P. placenta_ used for windows, 101
_Placunanomia_, _448_
_Placunopsis_, _448_
_Plagioptycha_, 347–351, _441_
_Plagioptychus_, _456_
_Planaxis_, _417_
_Planispira_, 311, 312, 319, _441_
_Planorbis_, 27, 247, _439_;
monstrosity, 93;
eye, 181;
_P. albus_, distribution, 282
_Platyceras_, 76, _412_
_Platydoris_, _434_
Platypoda, _411_
_Platyschisma_, _413_
_Plaxiphora_, _403_
_Plecochilus_, _442_
_Plecotrema_, _439_
_Plectambonites_, _505_
_Plectomya_, _459_
_Plectopylis_, 303, 305, 314, 316;
aperture, =63=
_Plectostylus_, 358, _442_
_Plectotropis_, 305, 306, 310, 311, 314–318, _441_
_Plectrophorus_, 298
_Plesiastarte_, _451_
_Plesiotriton_, _420_
_Pleurobranchaea_, 431;
jaws, =212=
_Pleurobranchoidea_, _431_
_Pleurobranchus_, 245, =428=, _431_;
warning coloration, 73;
jaws, =212=;
radula, 230
_Pleurocera_, 340, _417_
Pleuroceridae, origin, 17
_Pleurodonta_, 348;
aperture, =63=
_Pleuroleura_, _433_
_Pleuromya_, _458_
_Pleurophorus_, _451_
_Pleurophyllidia_, _433_;
breathing organs, =159=;
radula, 230
_Pleuropyrgus_, _357_
_Pleurotoma_, =426=, _426_;
slit, =263=, 265
_Pleurotomaria_, =266=, 373, 376, =407=, _407_;
prices given for recent, 122;
slit, 156;
radula, 226
_Plicatula_, _450_
Pliny the elder, on use of snails, 118, 120
_Plocamopherus_, _434_
_Plochelaea_, _425_
_Plutonia_, 298, _440_
_Pneumoderma_, 158, _437_, =438=
_Poecilozonites_, 352, _440_
Poisonous bite of _Conus_, 65;
poisonous oysters, 114;
mussels, 117
_Polycera_, _434_;
radula, 230
_Polycerella_, _434_
_Polyconites_, _456_
_Polydontes_, 346–351, =347=, _441_
_Polygona_, _424_
_Polygyra_, =340=, 345–353, _441_;
aperture, =63=
_Polygyratia_, =246=, 263, 357, _442_
_Polymita_, 346–351, =347=, _441_
Polyplacophora, 9, _401_ f.;
radula, 228
_Polytremaria_, =266=, _407_
_Pomatia_, 285, =293=, 295, _441_
_Pomatias_, 288, 289, 292 f., 302, _413_
_Pomatiopsis_, _415_
_Pomaulax_, _409_
_Pompholyx_, 250, 341, _439_
_Ponsonbya_, 332
_Poromya_, _459_;
branchiae, 168
_Porphyrobaphe_, 27, 356, _442_
Position of Mollusca in Animal Kingdom, 4
_Potamides_, =16=, _416_
_Potamomya_, _15_
_Potamopyrgus_, 325, 326, _415_
Poterioceratidae, _394_
_Praecardium_, _459_
_Prasina_, _449_
Prices given for rare shells, 121
Primitive mollusc, form of, 245;
types of, 7
_Prisogaster_, _409_
_Pristiloma_, 341, _440_
_Proboscidella_, 497, _504_
Productidae, 497, 500, _504_, 508
_Productus_, 492, 501, =502=, _504_;
stratigraphical distribution, 508
_Promachoteuthis_, _389_
_Proneomenia_, _404_;
breathing organs, 154;
nervous system, =203=;
radula, 229
_Prophysaon_, 341, _441_;
habits, 44
_Propilidium_, _405_
_Proserpina_, =21=, 355, _410_
_Proserpinella_, 354, _410_
Proserpinidae, relationships, 21
Prosobranchiata, _9_, _404_ f.;
breathing organs, 154
_Prosocoelus_, _451_
Protective coloration, 69 f.;
in snails, 70;
in Nudibranchs, 71 f.;
in other Mollusca, 74
Protegulum, 509
Protobranchiata, _447_;
branchiae, =166=
_Protoma_, _417_
Protremata, 511
_Provocator_, 376, _425_
_Psammobia_, _456_
_Pseudachatina_, 328–330, _443_
_Pseudedmondia_, _452_
_Pseudobalea_, 350
Pseudo-deltidium, 498, 511
_Pseudodon_, 295, 307, _452_
Pseudolamellibranchiata, 167, _449_
_Pseudoliva_, _424_
_Pseudomelania_, _417_
_Pseudomilax_, 296, _440_
_Pseudomurex_, _423_
_Pseudopartula_, 323
_Pseudosubulina_, _440_
Ptenoglossa, 224, _411_
_Pterinaea_, _449_
_Pteroceras_, 256, 262, _418_
_Pteroctopus_, _384_
_Pterocyclus_, =266=, 267, 300, 316, _414_;
tube, 157
_Pterodonta_, _418_
Pteropoda, _7_, _434_;
breathing organs, 158;
foot, 200;
radula, 230
_Pterotrachaea_, _421_;
foot, 200;
radula, =227=
_Ptychatractus_, _424_
_Ptychoceras_, _399_
_Ptychodesma_, _452_
_Pugilina_, _424_
Pulmonata, 10, 22, 151, 185, _438_;
origin, 17, 19;
breathing organs, 160;
nervous system, 203
_Pulsellum_, _444_
_Punctum_, _441_
_Puncturella_, =265=, _406_
_Pupa_, 289, 296, 325–357, _442_;
_P. cinerea_, hybrid union, 129
Pupidae, radula, 233
_Pupilla_, _442_
_Pupillaea_, _406_
_Pupina_, 157, 266, 309, 318–327, _414_
_Pupinella_, 318, _414_
_Purpura_, _423_;
operculum, =269=;
erosion, 276;
_P. coronata_, 367;
_lapillus_, feeding on _Mytilus_, 60;
on oysters, 111;
protective coloration, 69;
variation, =90=;
egg-capsules, 124;
time of breeding, 129;
distribution, 363 n.
_Purpuroidea_, _423_
_Pusionella_, _426_
_Pygocardia_, _451_
_Pygope_, 497
_Pyramidella_, _422_
Pyramidellidae, 262
_Pyrazus_, 50, _416_
_Pyrgina_, 330
_Pyrgula_, _415_
_Pyrochilus_, _441_
_Pyrolofusus_, _423_
_Pyrula_ (= _Pirula_), _419_, =420=;
spawn, =125=;
operculum, =269=
_Pythina_, _453_
_Quenstedtia_, _456_
_Quoyia_, 260, _417_
Rachiglossa, 220, _422_;
eggs, 124