Eubranchus pallidus (Alder & Hancock, 1842)

18 April, 2014.
Inverkip Pier, Firth of Clyde on the west coast.
25 mm animal at 8 m. Several similar sized animals seen and spawn masses. Water temperature 8° C.
Sony NEX-5 in Nauticam housing, 18-55mm lens with SubSee +10 dioptre and 2 x Inon D-2000 flashes.