Adalaria proxima (Alder & Hancock, 1854)

April, 2001 at En Ceann Feidh, Loch Nan Uamh near Arisaig on the west coast. 
Found on kelp blade at 6 metres, a 16mm long animal.
Nikon 90SX with 105mm lens in Subal housing and housed SB26 flash

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