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These small white bivalves are found with Venus mercenaria, burrowing on muddy or sandy flats near the lower part of the intertidal zones, and also in deeper waters. Although somewhat similar to Venus in appearance, Callocardia is much smaller and, unlike Venus, does not have a crenulated shell-margin. The species is moderately plentiful at Woods Hole, Mass., and may be collected by digging or dredging. The sexes are separate and similar in appearance.