Facelina auriculata (Müller, 1776)

12 August, 2014.
Near the Thesis wreck, Sound of Mull on the west coast .
20 mm animal on a sponge at 18 metres.
Water temperature 13°C.
Sony α6000  in Nauticam housing, 18-55mm lens, SubSee +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