Firm, free rim of mantle reflected, raised and scalloped into points.
Yellow pigment on oral tentacles (1) and medial band on the metapodium (2). Unipinnate, transparent , colourless gills with thick midribs (3) in a circle around the cylindrical, white anal papilla (4).
L. 12 mm. ELWS, Menai Strait, Wales. March 2011.