Limacia clavigera (Müller, 1776)

24 June, 2007.
Fast Castle, St. Abbs on the east coast.
A pair of 15 mm animals on the base of a kelp stipe at 12 m.
Water temperature 12° C.
Fuji 900 in Ikelite housing with Inon CU lens and 2 x Inon D-2000 flashes.

for more information about this species go to one of the links below
OPK - Opistobranquis nudibranchs of the british isles sea slug forum