Shell tubular, regular, symmetrical, lightly curved longitudinally, conic, attenuated insensibly posteriorly, and open at each extremity by a round orifice.

Dentalium elephantinum.

D. aprinum.

D. fasciatum.

D. entale.

D. Tarentinum.

D. corneum.

D. octoganum.

D. novemcostatum.

D. dentale.