CONCHOLOGY. 127 



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. PI. XL 



Anijnal. 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 XVIL 



Oaxalifera. Eleven genera. 

 1. Genus Cerithhim. PI. XL 



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. 



Shell. 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. 



