A fine and complete biconvex specimen with both valves. The permesothyridid foramen and delytherium show well, the anterior commissure is slightly uniplicate and the external ornament comprises concentric growth lines with a micro-ornament of fine pits. From Leighton Buzzard, Bedfordshire.
Size: 41 mm by 28 mm by 20 mm.
Size: 41 mm by 28 mm by 20 mm.