Facelina bostoniensis (Couthouy, 1838)

23 October, 2015.
Dodo's Rocks, Scapa Flow in the Orkney Islands.
28 mm animal at 18 metres. Water temperature 10.5°C.
Sony α6000  in Nauticam housing, Zeiss 50 mm macro 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