The spawn is a transparent ribbon containing white ova about six abreast. It is attached by one edge to rock or seaweed near its bryozoan prey in a small spiral of half to three turns. The ribbon is usually inclined from the vertical and may fall flat as in right image.
Left: adapted from Alder & Hancock (1845-1855) Fam. 1 Pl. 10 as Doris diaphana.
Right: © A. Rowat . Adult collected 26 May 2018. Spawned in captivity 3 June 2018. North Anglesey, Wales. Possible Bryozoan prey adjacent.