32 DESCRIPTION OF FIFTY-TWO SPECIES OF UNIONID^. 



jjah. — Tellico Eiver, Monroe Co., East Tennessee, Miss A. E. Law; East 

 Tennessee, J. C, Anthony. 



My cabinet, and cabinet of Mr. J. C. Anthony. 

 Diam. -7, . Length 1-8, Breadth 1-7 inch. 



Shell smooth, subtriangular, somewhat inflated, inequilateral, obtusely angular 

 behind and round before ; substance of the shell somewhat thick, a little thicker 

 before ; beaks somewhat prominent ; ligament small and dark brown ; epidermis 

 brownish-saffron, polished, with a few short interrupted, indistinct rays and with 

 close marks of growth; umbonial slope obtusely angular; posterior slope com- 

 pressed, cordate, with slightly impressed lines from the beaks to the margin; car- 

 dinal teeth small, crenulate and conical ; lateral teeth short, somewhat thick and 

 nearly straight ; anterior cicatrices distinct, rather small and deeply impressed ; 

 posterior cicatrices distinct and well impressed; dorsal cicatrices placed on the 

 upper side of the cavity of the beaks; cavity of the shell rather deep and rounded; 

 cavity of the beaks rather deep and subangular; nacre light salmon color, deeper 

 towards the margin, very iridescent. 



Remarks. — Two specimens only are before me ; one was obtained by Miss Law 

 and sent to Dr. Lewis, of Mohawk, N. Y. To him I am indebted for the possession 

 of it. The other was found by Mr. Anthony. In outline this species is nearest 

 to glandaceus (nobis), but may easily be distinguished by its being less inflated, 

 less thick in the substance of the valves, in having a polished epidermis, closer 

 marks of growth, and in the color being brownish- saffron. In the specimens before 

 me there are only a few close interrupted pencil rays. Other specimens may be 

 likely to have more rays, and some may be totally devoid of them. The beaks 

 being eroded, no undulations can be observed. The color and polish of the epi- 

 dermis are somewhat like those oi pyriformis (nobis). 



Unio Yadkinensis. pi. 10, fig. 29. 



Testa Isevi, oblonga, compressa, valde insequilaterali, postice subbiangulata, antice rotundata; valvulis 

 crassis; natibus prominulis ; epidermide tenebroso-fusca, eradiata ; dentibus cardinalibus parvi- 

 usculis, compressis, corrugatis, in utroque valvulo duplicibus ; lateralibns longis, lamellatis, cor- 

 rugatis subcurvisque ; margarita vel salmonea vel purpurea et valde iridescente. 



Shell smooth, oblong, compressed, very inequilateral, subbiangular behind, 

 rounded before ; valves thick ; beaks slightly prominent ; epidermis dark brown, 

 without rays; cardinal teeth rather small, compressed, corrugate and double in 

 both valves ; lateral teeth long, lamellar, corrugate and somewhat curved ; nacre 

 salmon colored or purplish and very iridescent. 

 Proc. Acad. Nat. Sei., 1812, p. 156. 



