10 



t'usca ; labro acuto; sinuoso, expanso ; columella paulisper incrassatd et 

 contorta. 

 Hah. — Flat Creek, Knox CO., Tenn., Prof. D. Christy. 



Trypanostoma canalitiom. — Testa canaliculata, conica, crassiusculfi, cornea, 

 obsolete vittata ; spira regulariter conica, subelevatfi, ad apicem bivittata ; 

 suturis impressis ; anfractibus planulatis ; instar Beptenis, ultimo canaliculato ; 

 apertura parvfi, rhomboidea, intus vel alba vel salmonia et vittata ; labro ac'Jto 

 et sigmoideo ; columella contorta, ad basim reeurva. 



Hah.— Yellowleaf Cr., Ala., E. R. Showalter, M. D. 



Descriptions of Ten new species of TJNIONIDiE of the United States 



BY ISAAC LEA. 



[Read April 22d, 1862.] 



Unio gkandidens-. — Testa valde tuberculatd, obliqua, ad umbones inflati ; 

 valvulis crassissimis, antice crassioribus ; natibus valde tumidis terminalibus- 

 que ; epidermide fusca, ; dentibus cardinalibus pergrandibus, percrassis corruga- 

 tisque; lateralibus crassis, sublongis, obliquis et valde corrugatis: margarita 

 alba et iridescente. 



ffab. — Near Hot Springs, Arkansas, Byrd Powell, M. D, 



Unio speciosus. — Testa, omnino tuberculata, fere granulata, quadrangulari, 

 valde compressa, ad latere planulata, subsequilaterali, postice subbiangulata, et 

 uiuarginaht, antice rotundata ; valvulis subcrassis, antice paulisper crassioribus : 

 natibus subelevatis, ad apices acuminatis et elegantissime perundulatis ; epi- 

 dermide viridi-lutea, substriata, vel obsolete radiata vel eradiata, submicanti ; 

 dentibus cardinalibus subgrandibus, compressis, obliquis, erectis, striatis, in 

 utroque valvulo duplicibus ; lateralibus rectis, sublongis obliquisque : margarita, 

 argentea et iridescente. 



Hah. — Colorado River, near Lagrange, Texas, Prof. Forshey ; and Leon Co., 

 Texas, Lieut. E. F. Beale. 



Unio Leibii. — Testa laevi, quadra, subcompressa, valde inaequilaterali, pos- 

 tice emarginata, antice rotundata, valvulis subcrassis, antice crassioribus ; 

 natibus subprominentibus, fere terminalibus; epidermide straminea, eradiata ; 

 dentibus cardinalibus subgrandibus, erectis striatisque ; lateralibus curtis, rec- 

 tis crassisque, in utroque valvulo duplicibus ; margarita alba et paulisper iri- 

 descente. 



Sab.— Erie Co., Michigan, G. B. Leib, M. D. 



