Bullina lineata (Gray, 1825)
Sometimes common in the Solitary Islands Marine Park. Recorded from Japan, Indonesia, and New Zealand. In Australia recorded from the Western Australia coast from Albany to Exmouth, on the east coast from far north Queensland south to eastern Victoria and including Lord Howe and Norfolk Island.
Found in intertidal and shallow subtidal areas, believed to feed on polychaete worms.
This species is able to retract completely into its shell and has a thin operculum. Grows to 20mm shell length.