Mature adult with white ovotestes (1). Six groups of cerata on right side can be discerned more easily than usual as they are small ones re-growing after loss.
Cerata have red-brown digestive gland (2) and a narrow, subterminal, opaque white ring (3) encircles the translucent white tip (4) containing cnidosacs.
Isle of Man, May 2016. © T. Nicholson.