Pleurobranchus membranaceus (Montagu, 1815)

June 1996.
At Loch Fyne on the west coast.
An individual 70 mm long, swimming in open water at 15 metres.
Nik 5 with 2:1 close up extension tubes and Ikelite 50 flash.

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