TilE NAUTILUS. 7 



the lip single and thin, columellar margin suddenly dilated and 

 reflexed at the axial insertion, a little thickened. Alt. 2.1, diam. 

 2,7 mm. 



Hirado, Hizen. Types no. 82969 A. N. S. P., from no. 891 of Mr- 

 Hirase's collection. Named for Mr. Oki, Mr. Hirase's correspond- 

 ent in Hirado. 



Kaliella hizeiiensis n. sp. 



Shell minute, imperforate, depressed-conic, thin, yellowish, some- 

 what transparent. Surface sculptured with excessively minute, 

 densely crowded radial striaj above, nearly smooth beneath. Spire 

 low-conic, composed of slightly more than 4 very convex, slowly in- 

 creasing whorls, the last rounded at the periphery, convex beneath, 

 impressed at the axis. Aperture oblique, rounded-lunate, the peri- 

 stome thin and simple, dilated and reflexed at the columellar inser- 

 tion. Alt. 1.4, diam. 1.9 mm. 



Hirado, Hizen. Types no. 82970. A. N. S. P., from no. 892 of 

 Mr. Hirase's collection. 



This very small species, of which 10 specimens were sent, is some- 

 what like K. pagoduloides, but more depressed and not so large. 



DESCKIPTION OF A NEW UNIO FROM TENNESSEE. 



BY \VM. A. MARSH, AI.EDO, MEKCKK CO., ILLINOIS. 



Quadrula Beauchampii n. sp. PI. 1, lower two figs. 



Shell subtriangular, inflated over the urabones and beaks; shell 

 very thick and solid, thicker before, beaks solid, raised and incurved, 

 inequilateral, rounded before, obtusely angular behind, ligament 

 short, thick, light brown, epidermis yellowish-brown, growth lines 

 close and very prominent, almost sulcate. Shell compressed at the 

 base, slightly flattened on the sides, umbonial slope rounded, poster- 

 ior slope rather wide, with a dark impressed line from beaks to basal 

 margin. Beak sculpture unknown. Cardinal teeth heavy and 

 solid, rather compressed, corrugate and sulcate, lateral teeth short, 

 thick and slightly curved. Anterior cicatrices small and deep, 

 posterior cicatrices distinct and well impressed, shell cavity wide 

 cavity of beaks deep and obtusely angular, nacre white. Dimen- 

 sions of an adult specimen: diam. 1.4, length 2.2, breadth 2.3 inclies. 



