Home > Invertebrates > Mollusks > Gastropods > Helmets > Semicassis bulla

Created 9/14/2025

Family Cassidae

WEST PACIFIC / HAWAII

Semicassis bulla



@ Padgett Carpenter

BUBBLE HELMET

Rare in sand deeper than 150 feet.  Attains 2.8 inches, 70 mm.  Hong Kong to Japan, Hawaii, and the Marquesas. Formerly known as Phalium bulla.