Polycera quadrilineata (Müller, 1776)

26 February, 2012.
Kentallen, Loch Linnhe on the west coast.
25 mm animal at 9 metres. Water temperature 8° 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 nudibranchs of the british isles sea slug forum