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Class: Bivalvia. 13 specimens. 5 have both valves still connected at the hinge. 4 right valves and 4 left valves but it's difficult to say if any other these individual valves were ever connected to each other. Small, sub-circular and asymmetrical. Clear radiating ribs as well as a small number of concentric growth lines. Off white or very pale brown in colour. Found in mud, sand, and fine gravel to about 160m depth. Shares a storage box with Cardium scabrum.