Carronella pellucida (Alder & Hancock, 1843)

21 October, 2015.
The Block, Gutter Sound, Scapa Flow in the Orkney Islands.
32 mm animal at 18 metres. Water temperature 11°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