Flabellina pellucida (Alder & Hancock, 1843)

25 June, 2015.
The Shuna, Sound of Mull on the west coast .
A 28 mm animal with spawn at 28 metres.
Water temperature 10°C.
Sony α6000  in Nauticam housing, 18-55 mm lens and 2 x Inon D-2000 flashes.