helmet shell

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hel′met shell`

1. a predatory marine gastropod of the family Cassidae, characterized by a thick heavy shell with a broadened outer lip.
2. the shell of this animal, used for making cameos.
References in periodicals archive ?
The large shells, from the Cassidae family of sea snails, are valued for their beauty and are often used as decorations and as fashion accessories.
The activity against fewer biofilm bacteria observed in Cronia margariticola and in other gastropod egg masses of Cassidae, Conidae, Cypraeidae, Alplysidae, and Buccinidae in the present study could be influenced by their stage of development.