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4th edit Acad Adams Alabama Anculosa Anculotus angular Anthony aperture large aperture ovate aperture rather large aperture small apex base Binney body-whorl Brot callus carinate Catlow Check List color colu columella Conch conchologists Conrad convex Coosa River dark brown DeKay Description Description.—Shell distinct E. R. Showalter elevated elliptical elongate epidermis figure flattened folds fusiform Genera genus Gyrotoma Habitat Haldeman half the length horn-color inch Jour Lea's Length of aperture Leptoxis Lithasia M.D. Diameter Melania Goniobasis millim Moll Monog nobis Nomenc number of whorls Observations Ohio River one-third the length Operculum ovate outer lip acute Philos plicate polar point Proc Prof purple Rafinesque Reeve rhomboidal Schizostoma Shell smooth shell.—Lea Shells U. S. sinuous sinus species striae sutures impressed sutures irregularly synonymy Tennessee Tennessee River thick thin Trans Troost Trypanostoma tubercles twisted type specimen upper whorls Wheatley whitish whorls six yellowish