plural of shell sac

(zoology) The sac in which the shell of a mollusc is secreted during development; (now especially) the fold of mantle in which a cephalopod secretes its pen or gladius.

plural of helmet shell

Synonym of helmet snail

plural of music shell

A Caribbean gastropod marked with figures resembling music notation.

plural of trumpet shell

A sea snail of the genus Charonia

A member of the genus Conus.

plural of cone shell