NEW UNIONIDvE OF THE UNITED STATES. 68 



Shell smooth, elliptical, subequilateral, at the side flattened or a little impressed ; 

 valves thick, thicker before; beaks swollen, somewhat raised and incurved; epidermis 

 yellowish olive, with close green rays; cardinal teeth rather large, raised, subcorneal, 

 crenulate, double in both valves; lateral teeth short, somewhat thick and rather 

 straight ; nacre white and iridescent. 



Proc. Acad. Nat. Sci. 1858, p. 40. 



Hab. — Cumberland River ; Dr. Troost and T. C. Downie. Florence, Ala. ; Rev. 

 G. White. 



My cabinet and cabinets of Mr. Downie and Mr. White. 

 Diarn. -9, Length 1-2, Breadth 1-6 inch. 



Shell smooth, elliptical, subequilateral, at the side flattened or a little impressed ; 

 substance of the shell thick, thicker before ; beaks swollen, somewhat raised and in- 

 curved, with rather coarse undulations ; ligament short, rather stout and bright 

 brown ; epidermis yellowish olive, with numerous close capillary rays over the whole 

 disk, and with distant marks of growth ; umbonial slope raised and angular ; posterior 

 slope wide, cordate, flattish, with two raised lines on each valve from the beaks to the 

 margin ; cardinal teeth rather large, raised, subcorneal, crenulate and double in both 

 valves; lateral teeth short, somewhat thick and rather straight; anterior cicatrices 

 distinct, rather small and deeply impressed ; posterior cicatrices confluent, rather large 

 and moderately impressed ; dorsal cicatrices placed over the centre of the cavity of 

 the beaks ; cavity of the shell deep and rounded ; cavity of the beaks deep and obtusely 

 angular ; nacre white and iridescent. 



Remarks. — This belongs to the group which embraces capsceformis, Florentinus, 

 biemarginatus, &c. It is much more solid and inflated than the first, more elliptical, 

 larger and more rayed than the second, and though some specimens are disposed to 

 be emarginate, they are less so than in the last, and it is greener and more inflated. 

 The figure is from a male. 



'-'- 



Unio propinquus. PI. 5, fig. 212. 



Testa subnodulosu, obliqufi, subtriangulavi, valde inajquilaterali, ad latere sulcata ; valvulis crassis, antice 

 crassioribus ; natibus erectis, tuniidis; epiderrnide vel lutea vel viridi, radiatfi ; dentibus cardinalibus 

 subgrandibus, crenulatis, in utroque valvule- duplicibus; lateralibus percrassis, crenulatis, curtis sub- 

 curvisque; margarita alba, et iridescente. 



Shell subnodulous, oblique, subtriangular, very inequilateral, sulcate on the sides ; 

 valves thick, thicker before ; beaks erect, swollen ; epidermis yellowish or green, rayed ; 

 cardinal teeth rather large, crenulate, double in both valves ; lateral teeth very thick, 

 crenulate, short and somewhat curved ; nacre white and iridescent. 

 Proc. Acad. Nat. Sci. 1857, p. 83. 



Hob.— Florence, Ala. ; Rev. G. White. Tuscumbia, Ala. ; L. B. Thornton, Esq. 



