Eubranchus tricolor Forbes, 1838

3 March, 2013.
Stallion Cliffs, Loch Fyne on the west coast. 
28 mm animal at 16 m. 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