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Related to tusk shell: class Scaphopoda
Any of various burrowing marine mollusks of the class Scaphopoda, having a long, tapering, slightly curved tubular shell. Also called scaphopod, tooth shell.
(Animals) any of various burrowing seashore molluscs of the genus Dentalium and related genera that have a long narrow tubular shell open at both ends: class Scaphopoda. Also called: tooth shell