Eubranchus farrani (Alder & Hancock, 1844)

26 July, 2012.
Greenends Gully, Eyemouth on the east coast.
20 mm animal at 11 metres in 12°C water.
Sony NEX-5 in Nauticam housing, 18-55mm lens, SubSee +10 dioptre and 2 x Inon D-2000 flashes.