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Amami Islands anteriorly aperture bands basal body whorl bottom in shallow brownish byssus callus central Honshu columellar crenulated dark brown Distribution dorsal margin Dunker Euhadra Family fathoms deep fathoms depth gaping Gastrochaenidae granules grooves ground color growth lines hinge plate Hokkaido Honshu and farther Honshu and southwards Honshu to Kyushu Indo-Pacific inflated interior KURODA Lamarck last species left valve light brown LlNNE longitudinal mantle line muddy bottom narrow operculum outer surface ovate in shape periostracum PlLSBRY posterior end posteriorly preceding species purplish brown radial ribs rays Reeve ridges right valve rostrated rounded Ryukyus shallow sandy bottom shallow waters shell is thin Shikoku solid south of Amami south of central southern Honshu Sowerby species in shape spines spiral ribs spiral threads spiral zones spire subtidal zone surface bears surface is covered surface is sculptured surface is smooth suture thick tide line Tosa Bay trigonal umbilicus umbo yellowish brown