118 CONCHOLOGY. 



tion of the decurrence of the spire; very pointed, and with 

 numerous whorls ; aperture rounded ; the edges posteriorly, the 

 right exceedingly thin, and slightly sinous towards the middle ; 

 operculum horny. Inhabits the Indian and American Oceans. 

 Fourteen living species. Thirty-seven fossil. 



Turritella duplicata, Turritella terebra. 



T. imbricata. T. replicata. 



T. fuscata. T. cornea. 



T. breviaUs. T. bicingulata. 



T. trisulcata. T. exoleta. 



T. catinifera. T. AustraUs. 



T. Virginiana.* T. saturalis.* 



8. Genus Rotella. PI. XL 

 Animal. See Turbo. 



Shell. Orbicular, glossy, destitute of epidermis, spire short, 

 subcoaic ; lower parts convex and callous ; aperture half round. 

 Indian Ocean. Seven species. 



Rotella lineolata. Kotella formosa. 



R. Javanica. R. saturalis. 



R. rosea. R. equalis. 



R. monolifera. 



FAMILY XVII. 



Can^lifera. Eleven genera. 

 1. Genus Cerithium. PI. 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. 



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. Inhabits the seas of N. Holland. Forty- 

 one living species. Sixty fossil. 



Cerithium palustre. C. fasciatum. 



C. telescopium. C. muricatum. 



