1: Exposed large white cnidosac. 2: Cnidosac obscured by white pigment. 3: Very large white cnidosac fills most of each ceras in ruff.
Rest of each ceras has digestive gland full of reddish ingested material. Yellowish pigment distally on rhinophores, oral tentacles and cerata.One black eye visible, other concealed by tilt of rhinophore. The distance between the bases of the oral tentacles is about the same as the thickness of a single tentacle base.
Length 8.6 mm. Menai Strait, Wales, September 2016.