07 Callochiton septemvalvis

07 Callochiton septemvalvis

Cerise specimen has an abrupt elevation of surface (1) on the lateral triangles where they border the pleural triangles. Valve surfaces finely shagreened (Montagu, 1803). Girdle has a pale band by each inter-valve suture. Length 35 mm, North Devon, England, March 2016. © R. Durrant.