Eubranchus farrani (Alder & Hancock, 1844)

22 August, 2017.
The Big Wall, island of Canna on the west coast.
6 mm animal at 6 metres. Water temperature 13°C.
Sony ?6000  in Nauticam housing, Zeiss 50 mm macro lens and 2 x Inon D-2000 flashes.