Onchidoris bilamellata (Linnaeus, 1767)

6 July, 2008.
Skelly's Holes, St Abbs on the east coast. 
There were many hundreds of these animals with their spawn in patches over the surfaces of rocks and reef throughout the dive in 4 - 14 m water.
Water temperature 11° C.
Fuji E900 camera in Ikelite housing, 2 x Inon D-2000 flashes and Inon CU lenses.

for more information about this species go to one of the links below
OPK - Opistobranquis

nudibranchs of the british isles sea slug forum