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Amami Islands anteriorly aperture bands basal body whorl bottom in shallow brownish byssus callus central HonshQ chondrophore 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 HonshQ and farther HonshQ and southwards HonshQ to KyushQ 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 PILSBRY posterior end posteriorly preceding species purplish brown radial ribs REEVE ridges right valve rostrated rounded Ryukyus shallow sandy bottom shallow waters shell is thin Shikoku solid south of Amami south of central southern HonshQ 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