[2] The back and sides of this slug are brownish and darker, with some brown and yellowish spots.

Near the foot the body is yellowish, with a greenish or orange hue.

The points of origin of the lateral grooves are about 5 mm apart at the mantle; they are not joined.

The shell is greenish or brownish with two whorls and a keeled suture.

[3] Morocco (Atlantic coast) Azores, Madeira, Canary Islands, Portugal, Spain, Channel Islands, France (Atlantic coast) and the British Isles (Britain and Ireland)[4]