Laona ventricosa (Jeffreys, 1865)

27 April, 2013.
Sgeir Port A'Ghuail, Loch Fyne on the west coast.
5 mm animal at 6 metres. The lower image shows the aimal 'flaring' it's mantle.Water temperature 7° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens with Subsea + 10 dioptre and 2 x Inon D-2000 flashes.

for more information about this species go to one of the links below
OPK - Opistobranquis   Sea Slug Forum