Adalaria proxima (Alder & Hancock, 1854)

20 December, 2012.
Dunollie, Oban on the west coast. 
12 mm animal at 8 m. Water temperature 9.5°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