Pleurobranchus membranaceus (Montagu, 1815)

2 May , 2011.
South Gortein, Loch Fyne on the west coast. 
95 mm spawning animal at 14 m. There were many animals mating , spawing and feading and spawn spirals between 12 - 14 m. Water temperature 9°C.
Canon S95 in Ikelite housing.
for more information about this species go to one of the links below
scottish nudibranchs Encyclopedia of Marine Life of Britain and Ireland sea slug forum