Trinchesia caerulea (Montagu, 1804)

January 2001.
Lephinchapel, Loch Fyne on the west coast.
This pair show some of the colour differences found in this species which ranges from bright blue through to green.

for more information about this species go to one of the links below
scottish nudibranchs

 nudibranchs of the british isles sea slug forum