Facelina bostoniensis (Couthouy, 1838)

27 November, 2011.
Lochside Cottages, Loch Leven on the west coast.
18 mm animal at 14 metres. Water temperature 11°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