Onchidoris bilamellata (Linnaeus, 1767)

March 2000.
Dunollie Point, Oban on the west coast.
Around 12 to 14 metres there were many of areas of spawn on the smooth upper surface of small rocks lying within the gritty sand substrate. There were large numbers of the animal in groups and singly nearby.

for more information about this species go to one of the links below
OPK - Opistobranquis

 nudibranchs of the british isles sea slug forum