Doto fragilis (Forbes, 1838)

19 June, 2014.
Eilean nan Coinean, Sound of Jura on the west coast. 
15 and 20 mm animals on a hydroid at 18 m. 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