Pleurobranchus membranaceus (Montagu, 1815)

26 February, 2006.
South Gortein Reef, Loch Fyne on the west coast.
This is one of several animals 50 - 70 mm, seen over both dives on this day between 8 - 17 metres depth. The water temperature was 8°C.
Fuji 810 camera in Ikelite housing, Inon WA lens and Inon D-2000 flashes.