Polycera quadrilineata (Müller, 1776)

15 July, 2012.
Greenends Gully, Eyemouth on the east coast.
The largest animal in this 'family' group was approx 9 mm.
Feeding on the bryazoan growing on kelp blade at 10 metres. Water temperature 12° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens with Subsea + 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