Eubranchus pallidus (Alder & Hancock, 1842)

14 June, 2014.
Skelly Hole, St. Abbs on the east coast.
6 mm animal at 12 metres. Water temperature 12°C.
Sony NEX-5 in Nauticam housing, Zeiss 50 mm macro lens and 2 x Inon D-2000 flashes.