204 NEW UNIONIDiE OF THE 



slightly impressed ; posterior cicatrices confluent, small and very slightly impressed ; 

 dorsal cicatrices placed above the centre of the cavity of the beaks ; cavity of 

 the shell very shallow ; cavity of the beaks very shallow and obtusely angular ; 

 nacre white or purple and iridescent. 



Remarks. — This is a small, very much compressed species, and is allied in 

 outline to subgibbosus. (nobis,) but has not thick valves as that species has. It 

 is also more rounded at the posterior margin. Among the numerous new species 

 sent to me by Prof. Emmons were several smaller specimens of this species, which 

 do not appear to me to be quite adult. 



Unio Bealei. PL 30, fig. 273. 



Testa laevi, elliptica, subcompressa, insequilaterali, postiee obtuse angulata, antice rotundata ; valvulis 

 crassiusculis, antice crassioribus ; natibus prominulis ; epidernride vel tenebroso-fusca vel nigri- 

 cente, obsolete radiata ; dentibus eardinalibus parvis. compressis, crenulatis, acuininatis, in utro- 

 que valvulo duplicibus ; lateralibus prselongis, subcurvis, lamellatis ; margarita vel alba vel 

 dilute salnionia et valde irideseente. 



Shell smooth, elliptical, somewhat compressed, inequilateral, obtusely angular 

 behind, rounded before ; valves slightly thickened, thicker before ; beaks a little 

 prominent ; epidermis dark brown or blackish, obscurely radiate ; cardinal teeth 

 small, compressed, crenulate, pointed and double in both valves ; lateral teeth 

 very long, slightly curved and lamellar; nacre white or pale salmon and very 

 iridescent. 



Proo. Aead. Nat. Sei., 1862, p. 169. 



Hab. — Leon County, Texas, Lieut. E. F. Beale, U. S. Navy. Rutersville, 

 Texas, Prof. Porshey. 



My cabinet and cabinets of Smithsonian Institution and Prof. Forshey. 

 Diam. - 6, Length 1, Breadth l - 7 inches. 



Shell smooth, elliptical, somewhat compressed, inequilateral, obtusely angular 

 behind, rounded before ; substance of the shell slightly thickened, thicker before ; 

 beaks a little prominent ; ligament rather short, thin and dark brown ; epidermis 

 dark brown or blackish, obscurely radiate and with distant marks of growth ; 

 umbonial slope slightly raised and rounded; posterior slope very narrow, slightly 

 raised, with two lines on a lighter ground from the beaks to the margin ; cardinal 

 teeth small, compressed, crenulate, pointed and double in both valves; lateral 

 teeth very long, slightly curved and lamellar; anterior cicatrices distinct, rather- 

 large and moderately impressed; posterior cicatrices confluent and very slightly 

 impressed ; dorsal cicatrices placed nearly across the centre of the cavity of the 

 beaks ; cavity of the shell shallow and wide ; cavity of the beaks shallow and 

 obtusely angular; nacre white or pale salmon and very iridescent. 



Remarks. — Quite a number of this species was brought by Lieut. Beale. A 



