Favorinus branchialis (Rathke, 1806)

21 June , 2009.
Weasel Loch, Eyemouth on the east coast. 
A 25 mm animal, one of three from 15 mm size, at 8 m. Water temperature 10.5°C.
Fuji E900 in Ikelite housing, 2 x Inon CU lenses 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