helmet shell

noun
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, often used for making cameos.

Origin:
1745–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

helmet shell

any marine snail of the family Cassidae (subclass Prosobranchia, class Gastropoda), characterized by a large, thick shell with a shieldlike inner lip. An example is the 18-centimetre (7-inch) king helmet (Cassis tuberosa) of the Caribbean.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
One completely furnished helmet shell of each size being procured.
Stick them to the helmet shell so that when you put the helmet on, it feels snug but not too tight.
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