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; T. fuscata. T. cornea. 
T. brevialis. T. bicingulata. 
T. trisulcata. T. exoleta. 
T. carinifera. T. Australis. 
T. Virginiana.* T. saturalis.* 
T. alternata.* T. equalis.* 
T.. impressa.* T. erosa.* 
T, concava.* T.. reticulata.* 
T. bisuturalis* 
8. Genus Rotella. Pl. XI. 
Animal. See Turbo. 
Shell. Orbicular, glossy, destitute of epidermis; spire short, 
subconic ; lower parts convex and callous; aperture half round. 
Indian Ocean. Seven species. 
Rotella lineolata, Rotella formosa. 
R. Javanica. R., saturalis. 
R, rosea, R, equalis. 
R. monolifera. 
FAMILY XVII. 
Canatirera, Eleven genera. 
1. Genus Cerithium. Pl. XI. 
Animal. Much elongated ; the mantle prolonged into a canal 
at its left side, but without a distinct tube; the foot short, oval, 
with an anterior marginal furrow ; the head terminated by a de- 
pressed proboscidiform muzzle. 
Sheil. More or less turriculated and tuberculous; aperture 
small, oval, and oblique; the columellar edge much excavated 
and callous, the right edge trenchant, and slightly dilating with 
age. Operculum horny, oval, round, subspiral, and striated, 
upon the external face. They are found in almost every sea. 
Forty-five living species. Sixty fossil. 
