D. nigrum.
D. politum.
D. eburneum.
D. elephantinum. The Elephant’s Tooth Shell.
Species in which the tube is striated or ribbed longitudinally; the ribs are generally ten in number; green colour.
D. entale. The common Dentalium. Pl. [33], fig. 1.
Species very minutely striated; white or yellowish colour.
D. pellucidum. The pellucid Dentalium.
Species narrow and thin; pale topaz colour.
D. politum. The ring-striated Tooth Shell.