Shell. Turreted, not nacred, rather thin, striated in the direction of the decurrence of the spire; very pointed, and with numerous whorls; aperture rounded; the edges posteriorly, the right exceedingly thin, and slightly sinuous towards the middle; operculum horny. Inhabits the Indian and American Oceans. Twenty-one living species. Thirty-seven fossil.
- Turritella duplicata.
- T. imbricata.
- T. terebra.
- T. replicata.
- T. fuscata.
- T. brevialis.
- T. trisulcata.
- T. carinifera.
- T. cornea.
- T. bicingulata.
- T. exoleta.
- T. Australis.
- · · · · ·
- T. Virginiana.*
- T. alternata.*
- T. impressa.*
- T. concava.*
- T. saturalis.*
- T. equalis.*
- T. erosa.*
- 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.
- R. Javanica.
- R. rosea.
- R. formosa.
- R. saturalis.
- R. equalis.
- R. monolifera.
FAMILY XVII.
Canalifera. 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 depressed 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.