A marine shell, formerly classed with the Nerita, but distinguished by
being without teeth, and having an umbilicus modified by the callosity.
Shell smooth, rather thin, and not covered with epidermis; the spire
evident, though low, umbilicated; the columellar edge not toothed, more
or less callous, modifying the umbilicus; the right edge thin and not
toothed interiorly; operculum calcareous or horny and smooth,
semi-spiral, with concentric ribs fitting into a slight groove on the
columella.
Natica glaucina.
N. albumen.
N. mamillaris.
N. mamilla.
N. ampullaria.
N. canrena.
N. cruentata.
N. millepunctata.
N. vitellus.
N. helvacea.
N. collaria.
N. monilifera.
N. labrella.
N. rufa.
N. uni-fasciata.
N. melanostoma.
N. aurantia.
N. conica.
N. plumbea.
N. lineata.
N. fulminea.
N. maculosa.
N. vittata.
N. castanea.
N. Marochiensis.
N. arachnoidea.
N. zebra.
N. zonaria.
N. Chinensis.
N. Javanica.
N. cancellata.
_N. canrena._ The Canrena Natica.
Sub-globular, smooth, umbilicus deep, bordered anteriorly by a kind of
callous column; spire a little prominent; exterior fawn coloured, with
bands and rays of reddish brown; interior white; operculum calcareous.
_N. castanea._ The chestnut Natica. Pl. 21, fig. 6.
Species with the umbilicus uncovered, and the operculum horny.
_N. mamilla._ The nipple Natica.
Species with the umbilicus entirely covered over by a large callosity;
the spire papillose, and the operculum horny.