Antiopella cristata (delle Chiaje, 1841)

6 July, 2014.
Greenends Gully, Eyemouth on the east coast. 
30 mm animal at 9 m. Water temperature 12°C.
Sony α6000 in Nauticam housing, 18-55mm lens 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