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6. 12 Pecten irradians, Lamarck common scallop. 13 Pecten tenuicostatus, Mighels Great scallop 14 Cardium magnum, Born. Big cockle. Pacific Coast of United States 15 Ostrea lurida, Cpr Native oyster. 16 Mya arenaria, Linn. Softshelled or longnecked clam (introduced).