Tritonia plebeia Johnston, 1828

8 August , 2009.
Tye's Tunnel, St. Abbs on the east coast. 
This 25 mm animal was found atop the little Hermit crab at 12 m. Water temperature 14°C.
Fuji E900 in Ikelite housing, 2 x Inon CU lenses and 2 x Inon D-2000 flashes.

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