Duvaucelia lineata (Alder & Hancock, 1848)

10 August, 2003.
Rubha ne Creige, Loch Etive on the west coast. 
At 25 metres in 12 C water, a 25mm long animal.
Olympus C2020-Z in PT-010 housing with 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