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Family Aplustridae

HAWAII

Hydatina amplustre

Makapu'u tidepool, Oahu

 

Kaloko, Oahu, 6 feet

Black Point, Oahu

 

Kapoho tidepool, Hawaii

Kapoho tidepool, Hawaii

 

Diamond Head, Oahu

Diamond Head, Oahu

SWOLLEN BUBBLE

Locally common in silty sand under rocks in shallow water during winter.  Usually found inhabited by a hermit crab.  Shell coated with thin yellow periostracum.  Shell attains 1 inch.  Hawaii & the Indo-Pacific.