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Amami Islands anteriorly aperture basal body whorl bottom in shallow bution byssus callus canal central Honshū columellar dark brown Distri Distribution dorsal margin elongated encircled epiderm Euhadra Family farther south fathoms depth granules ground color growth lines Hokkaidó Honshū and farther Honshū and southwards Honshū to Kyūshū Indo-Pacific inflated inner lip Japan KURODA LAMARCK last species light brown LINNé muddy bottom narrow operculum outer lip margin outer surface P L A T E periostracum PILSBRY posterior end preceding species protoconch purplish brown radial ribs REEVE right valve rostrated rounded Ryukyus sculptured shallow waters Shikoku siphon south of Amami south of central south of Honshū southern Honshū SoweRBY species in shape spines spiral ribs spiral striae spiral threads spiral zones spire subtidal zone surface bears surface is covered surface is sculptured surface is smooth suture teeth thick tide line tide marks Tosa Bay trigonal tubercles umbilicus umbo yellowish brown