Favorinus branchialis (Rathke, 1806)

9 July, 2009.
Skellies Hole, St. Abbs on the east coast.
25 mm animal at 8 metres. One of several seen at this location and around this depth. Also note the much smaller nudibranch egg predator Favorinus blianus to the bottom right of the egg mass.
Water temperature 14° C.
Fuji E900 camera in Ikelite housing, 2 x Inon D-2000 flashes and 2 x 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