Duvaucelia lineata (Alder & Hancock, 1848)

22 July, 2001.
At 8 mile reef, Loch Etive on the west coast.
At 28 metres in 10° C water, an 18mm long individual, one of several found crawling on boulders.
Taken using a Nikonos 5 with 2:1 extension tube and Ikelite 50 flash.
for more information about this species go to one of the links below
OPK - Opistobranquis nudibranchs of the british isles sea slug forum