12. _Phalansterium consociatum_, Cienk. (_Choanoflagellata_); X 325.
Disk-like colony.
13. _Euglena viridis_, Ehr.; X 300 (_Euglenidae_).
a = pigment spot (stigma).
b = clear space.
c = paramylum granules.
d = chromatophor (endochrome
plate).
14. _Gonium pectorale_, O. F. Muller (_Volvocineae_). Colony seen from
the flat side; X 300.
a = nucleus.
b = contractile vacuole.
c = amylon nucleus.
15. _Dinobryon sertularia_, Ehr. (_Chrysomonadidae_).
a = nucleus.
b = contractile vacuole.
c = amylon nucleus.
d = free colourless flagellates, probably not belonging to
Dinobryon.
e = stigma (eye-spot).
f = chromatophors.
16. _Peranema trichophorum_, Ehr. (Peranemidae), creeping individual
seen from the back; X 140.
c = pharynx.
d = mouth.
17. Anterior end of _Euglena acus_, Ehr., in profile.
a = mouth.
b = vacuoles.
c = pharynx.
d = stigma (eye-spot).
e = paramylum-body.
f = chlorophyll corpuscles.
18. Part of the surface of a colony of _Volvox globator_, L.
(_Volvocidae_), showing the intercellular connective fibrils.
a = nucleus.
b = contractile vacuole.
c = starch granule.
19. Two microgametes (spermatozoa) of _Volvox globator_, L.
a = nucleus.
b = contractile vacuole.
20. Ripe asexually produced daughter-individual of _Volvox minor_,
Stein, still enclosed in the cyst of the partheno-gonidium.
a = young, partheno-gonidia.
21. 22. _Trypanosoma sanguinis_, Gruby (_Haematoflagellates_), from
the blood of _Rana esculenta_.
a = nucleus; X 500.
23-26. Reproduction of _Bodo caudatus_, Duj. (_Bodonidae_), after
Dallinger and Drysdale:--23, fusion of several individuals
(plasmodium);
24, encysted fusion-product dividing into four; 25, later into eight;
26, cyst filled with swarm-spores.
27. _Distigma proteus_, Ehbg., O.F. Muller (_Euglenidae_); X 440.
Individual with the two flagella, and strongly contracting hinder
region of the body.
28. The same devoid of flagella.
c, c = the two dark pigment spots (so-called eyes) near the mouth.
29. _Oicomonas termo_ (_Monas termo_) Ehr. (one of the
_Oicomonadidae_).
c = food-ingesting vacuole.
d = food-particle; X 440.