Full grown adult with numerous cerata arranged in crowded rows on each side of the body leaving most of the notum exposed. Cerata extend in front of rhinophores. Yellowish-brown digestive gland is visible within the cerata.
Translucent body reveals, in the anterior half, white reproductive and digestive organs and internal black eyes on the circum-oesophageal nerve ring to the rear of the rhinophores and, in the posterior half, pink spheroid ovotestes. There are no opaque surface markings.
Cornwall, England, May 2015, © D.Fenwick.