Pleurobranchus membranaceus (Montagu, 1815)

1999.
Known locally as the Highland Dancer after its ability to swim in the manner of its Spanish relative.
Nik 5 with 2:1 close up extension tubes and Ikelite 50 flash.

for more information about this species go to one of the links below
OPK - Opistobranquis Encyclopedia of Marine Life of Britain and Ireland sea slug forum