304 NEW UNIONID^, MELANID^, ETC., 



of Major Downie, of Georgia, I am in possession of five more. ' All the specimens I 

 have differ so little, that I am able to satisfy myself of the distinctness of the species. 

 It is most closely allied to mimdus (nobis), but may be distinguished by being more 

 inflated, being more curved at the basal margin, and in having green bands along the 

 marks of growth, mundus having maculate or interrupted rays. It also has the 

 teeth more solid than mundus. 



Unio Uhaeeensis. pi. 46, fig. 116. 



Testa Isevi, oblonga, ad latere planulata, intequilaterali, postice biangulata, autice rotundata ; valvulis 

 crassiusculis, autice crassioribus ; natibus prominulis ; epidermide rufo-fusca, subsquamea, eradiata ; 

 dentibus cardinalibus parvis, striatis, in utroque valvule duplicibus ; lateralibus lougis, lamellatis 

 subcurvisque ; margarita vel alba vel salmonis colore tiucta. 



Shell smooth, oblong, flattened at tlie sides, inequilateral, biangular behind and 

 rounded before; valves somewhat thick, thicker before; beaks slightly prominent ; 

 epidermis reddish-brown, somewhat squamose, without raj'S ; cardinal teeth small, 

 striate, in both valves double ; lateral teeth long, lamellar and somewhat curved; 

 nacre white or salmon color. 



Proc. Acad. Nat. Sci. 1868, p. 145. 



Eal. — Uharee River, Montgomery Co., N. C, F. A. Genth, M.D. 



My cabinet and cabinets of Academy of Natural Sciences and Dr. Genth. 

 Diam. -8, • Length 1-3, Breadth 2-3 inches. 



Shell smooth, oblong, flattened at the sides, biangular behind, rounded before, 

 inequilateral; substance of the shell somewhat thick, thicker before; beaks a little 

 prominent ; ligament rather long, dark brown ; epidermis reddish-brown, with rather 

 distant marks of growth, without rays, squamose on the anterior and basal margins; 

 umbonial slope obtusely angular; posterior slope slightly carinate; cardinal teeth 

 small, striate, double in both valves, slightly raised and nearly perpendicular; lateral 

 teeth long, lamellar, somewhat thick and slightly curved ; anterior cicatrices distinct, 

 rather large and well impressed; posterior cicatrices distinct, large and well 

 impressed ; dorsal cicatrices small, and placed above the centre of the cavity of the 

 beaks; cavity of the shell shallow; cavity of the beaks very shallow; nacre white, 

 generally tinted with salmon-color in the cavity of the beaks, iridescent. 



Remarks. — Dr. Genth very kindly submitted a number of specimens to my exami- 

 nation. They were of very different ages, but none, even the very young, had beaks 

 perfect enough to observe undulations. It is allied to salehrosus (nobis), from Georgia, 

 but none of the specimens I have are so large as those of salehrosus. The epidermis 

 is rougher, more rubiginose, more squamose, and has none of the greenish rays which 

 that shell has. It is not so inequilateral ; the teeth are very much the same. 



