helmet shell

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hel′met shell`


n.
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.
[1745–55]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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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.
Philippines seizes 1,000 rare sea snail shells
--1975/1 The rediscovery of Morum praeclarum Melvill (Cassidae).
Richard ('Dick') Neil Kilburn (1942-2013): bibliography and listings of new taxa named by him and in his honour
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.
Potential antimicrobial activity of marine molluscs from tuticorin, southeast coast of India against 40 biofilm bacteria
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