Deep-sea mollusk

Wiktionary Word definitions in Wiktionary
n. Any of numerous species of elegant, usually white, marine shells of the genus (taxlink Epitonium genus noshow=1), especially (taxlink Epitonium scalare species noshow=1), which was formerly highly valued.

Wikipedia Word definitions in Wikipedia
Wentletraps are small, often white, very high- spired , predatory or ecto parasitic sea snails , marine gastropod mollusks in the family Epitoniidae . The word wentletrap originated in Dutch ( wenteltrap ), and it means spiral staircase. These snails are ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Scalaria \Sca*la"ri*a\, n. [L., flight of steps.] (Zo["o]l.) Any one of numerous species of marine gastropods of the genus Scalaria , or family Scalarid[ae] , having elongated spiral turreted shells, with rounded whorls, usually crossed by ribs or varices. ...