Polycera quadrilineata(Müller, 1776)

27 April, 2013
Bark Rock, Loch Fyne on the west coast.
15 mm animal at 12 metres. Water temperature 7° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens, SubSee +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