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Updated 6/12/2021

Family Cassididae

HAWAII - ENDEMIC

Casmaria kayae

Oahu, Hawaii

KAY'S BONNET or HELMET

Rare in sand in deep water, usually collected empty or inhabited by hermit crab.  Shoulder slightly convex, outer lip & columella may be thick, 4 to 6 teeth on lower portion of outer lip, aperture wine-colored.  Attains 4 inches.  Endemic to Hawaii.