Journal of the Academy of Natural Sciences of Philadelphia

Acad antice crassioribus aperture bands beaks beaks a little beaks somewhat prominent body whorl Breadth cabinet and cabinet cabinet of Dr cardinal teeth cardinal teeth small caudal cavity cicatrices distinct color columella compressed corrugate crenulate dentibus cardinalibus Diam distant marks dorsal cicatrices placed dorsal fin elliptica elliptical epidermis dark brown flattened genus GONIOBASIS Gram's Oz inch inequilateral inflated instar iridescent labro acuto lamellar lateral teeth long Length ligament little prominent M. D. My cabinet margarita marks of growth muzzle nacre white natibus prominulis nobis oblique obtusely angular Operculum outer lip acute papillæ parotoid glands planulatis plicate posterior cicatrices confluent posterior slope Proc quinis Remarks River rounded salmon color Shell smooth slightly impressed species spira spire Steindachner striæ striate sulcate sutures sutures impressed Testa lævi thicker thin tips transverse umbonial slope undulations Unio Unionida valde inæquilaterali valde iridescente valvulis vomerine teeth white and iridescent whitish whorls xiphisternum