Dendronotus lacteus (Thompson, 1840)

29 March, 2015.
Glas Eilean, Loch Fyne on the west coast .
35 mm specimen on hydroid at 14 metres.
Water temperature 7°C.
Sony α6000  in Nauticam housing, 50 mm Zeiss lens and Sola 1200 video light.

for more information about this species go to one of the links below
OPK - Opistobranquis nudibranchs of the british isles sea slug forum