• Commonly called as ‘Sea – hare’.

• Creeping as well as swimming, herbivorous gastropod, living in shallow coastal areas.

• Colour varies with surroundings.

• When disturbed, discharges a purple fluid by purple gland in its mantle cavity.

• Shell is internal, much reduced.

• Almost completely enclosed by mantle.

• Head is prominent, neck is extensile.

• Mantle cavity houses the Gills, Osphradium and unicellular purple gland.

• Foot is broad and flat.