Eubranchus pallidus (Alder & Hancock, 1842)

6 March 2013.
Inverkip Pier, Firth of Clyde on the west coast.
25 mm animal with spawn on a pier leg at 7 m. Water temperature 6.5° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens with SubSee +10 dioptre and 2 x Inon D-2000 flashes.