Disarticulated valves. Length 29 mm when live. LWS. Isle of Lewis, Scotland. April 2018. Leg. D.M. McKay & S.Taylor.
Eight overlapping valves have an upper layer, ‘tegmentum’, of coloured aragonite, and a lower layer, ‘articulamentum’, of white or, sometimes on jugal tract, pink (1) or yellow aragonite. The tegmentum on intermediate valves (ii –vii) has slightly rounded end margins (2) , and nearly straight and parallel anterior and posterior margins, except the anterior of valve ii which projects more at its jugum (centre) (3). The apophyses on valve ii are more angular 4, and those on valve viii are smaller and more angular 5.

marinvert.senckenberg.science/image-browse/