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Class: Bivalvia. 13 specimens. 9 have both valves still connected. 2 right valves and 2 left valves though it's difficult to say if any of them came from the same animal. Small, broadly oval with clear radiating ribs and a small number of concentric ribs. Off white or pinkish in colour. This species is widespread in the shallow sublittoral zone. Shares a storage box with Cardium minimum.