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Living MaterialAdults are found near or below the low-water mark, burrowing in mud, sandy mud, or sand in sheltered bays, harbors and estuaries. If not available at Woods Hole they can be shipped in from Maine or from north of Cape Ann, Mass. The sexes are separate. Sexually ripe males are bright red, ripe females dull, brownish red; in spent animals these colors fade (Coe, 1895).