Facelina auriculata (Müller, 1776)

22 July, 2009.
Cul Cleite, Dun, St. Kilda on the west coast. 
35 mm animal, one of many, found at 16 m. Water temperature 13° C. Photographed in the lab.
Fuji E900 2 x Inon D-2000 flashes and +10 CU lens.

for more information about this species go to one of the links below
OPK - Opistobranquis

 nudibranchs of the british isles sea slug forum