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.