Definitions from Wiktionary (bubble shell)

▸ noun:  Any of the headshield slugs of genus Bulla, belonging to the order Cephalaspidea of gastropods.
▸ noun:  (malacology) A marine univalve shell of the genus Bulla (Bullidae) and certain shells of similar appearance of the now disused order Tectibranchiata of molluscs.
▸ noun:  Any of the family Epitoniidae (syn. Janthinidae), of pelagic sea snails.
▸ Also see bubble_shell


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