58 SUPPLEMENT TO ISAAC LEA'S PAPER ON UNIONID^. 



prominent ; epidermis yellowish-olive, somewhat shining, without rays ; cardinal 

 teeth large, sulcate, double in both valves ; lateral teeth very thick and oblique ; 

 nacre white and iridescent. 



Proc. Acad. Nat. Sci., 1813, p. 422. 



J£ah. — Catawba River, Fox and Yadkin Rivers, N. Carolina, C. M. Wheatley. 



My cabinet and cabinet of Mr. Wheatley. 

 Diara. I'l, Length 1-7, Breadth 2-7 inches. 



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

 behind, rounded before ; substance of the shell thick, rather thicker before ; beaks 

 slightly prominent ; ligament short, thick and light brown ; epidermis yellowish- 

 olive, somewhat shining, without rays and with rather distant marks of growth ; 

 umbonial slope raised and obtusely angular ; posterior slope subcarinate, elliptical, 

 with impressed lines from the beaks to the posterior margin ; cardinal teeth large, 

 sulcate, double in both valves ; lateral teeth very thick, corrugate and oblique ; 

 anterior cicatrices distinct, large and well impressed ; posterior cicatrices confluent, 

 large and moderately impressed ; dorsal cicatrices placed above the centre of the 

 cavity of the beaks; cavity of the shell rather deep and wide; cavity of the beaks 

 rounded ; nacre white and iridescent. 



Remarks. — I have eight specimens before me from different habitats. All have 

 a pale olivaceous epidermis. In outline and general character it is closely allied 

 to TJ. Savannahensis (nobis). It is rather smaller, more compressed, and differs in 

 the color of the epidermis. None have beaks perfect enough to exhibit the 

 character of the tips. 



Unio subcylindraceus. pi. 20, fig. 57. 



Testa Isevi, valde transversa, subcylindracea, valde insequilaterali, postice obtuse biangulari, antice 

 oblique rotundata; valvulis crassis, antice paruna crassioribus ; natibus prominulis ; epidermide 

 luteo-viridi, perradiata; dentibus cardinalibus subparvis, compresso-conicis crenulatisque ; late- 

 ralibus prselongis, lamellatis subrectisque; margarita vel alba vel purpurea vel salmonla coloris 

 tincta et valde iridescente. 



Shell smooth, very transverse, subcylindrical, very inequilateral, obtusely bian- 

 gular behind, obliquely rounded before ; valves thick, somewhat thicker before ; 

 beaks a little prominent; epidermis yellowish-gieen, much radiated; cardinal teeth 

 rather small, compressed conical and crenulate; lateral teeth very long, lamellar 

 and nearly straight ; nacre white, purple or salmon colored and very iridescent. 

 Proc. Acad. Nat. Sci., 1873, p. 422. 



Jlah. — Rocky Creek, near Macon, Georgia, J. C. Plant; and Carter's Creek, 

 Georgia, J. Postell, 



