Janthinidae: Janthina globosa Swainson, 1822 (‘globose violet-snail’)

Synonym(s): globosa Swainson, 1826 prolongata Blainville, 1822.
Typical shell-length 30 mm. Lives afloat on ocean surface by means of a bubble-raft. Native. Occurs in eastern Australia (QLD, NSW, TAS and VIC); also widespread elsewhere in warm seas.