Catriona aurantia (Alder & Hancock, 1842)

20 October, 2002.
South Gortein, Loch Fyne on the west coast.
At 25 metres on the cable in among Tubularia sp. in 12° C water, a 15mm long individual, one of many dozen with spawn.
Nikon 90SX with 60mm lens in Subal housing and Nikonos 105 flash.

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