306 PROCEEDINGS OF THE ACADEMY OF 



Unio cognatus. Testa laevi, elliptica, crassa, subinflata, valde inaequilaterali, 

 postice obtuse angulata, antice rotundata ; valvulis crassis, antice crassioribus :; 

 natibus subprominentibus; epidermide luteolaradiataque ; dentibus cardinali- 

 bus grandibus, crassis, pyramidatis, rugoso-striatis ; lateralibus subcurtis, sub- 

 curvis crassisque ; margarita. alba et valde iridescente. 



Hah. Rio Salado, New Leon, Mexico, L. Berlandier, M. D. 



Descriptions of Seven New Species of UNIONID.E from the United States. 



BY ISAAC LEA. 



Ukio Lesleyi. Testa laevi, obliqua, subcompressa, ad latere planulata., valde 

 insquilater'ali, postice angulata, antice rotunda; valvulis crassis, antice cras- 

 sioribus; natibus subelevatis ; epidermide luteola, radiis interrupts; dentibus 

 cardinalibus crassis, compresso-conicis, obliquis ; lateralibus longis, crassis 

 subcurvisque: margarita alba et iridescente. 



Bab. Kentucky, Mr. Joseph Lesley. Tennessee, Mr. J. G. Anthony. 



Unio castus. Testa, laevi, inflata, inaequilaterali, postice angulata, antice 

 rotunda, valvulis crassiusculis, antice crassioribus ; natibus subprominentibus ; 

 epidermide micante,luteo-viridi, radiata ; dentibus cardinalibus subgrandibus, 

 compresso-conicis, striatis crenulatisque ; lateralibus subbrevibus, rectis, la- 

 mellatis striatisque ; margarita alba et iridescente. 



Bab. South Carolina, Prof. Tuomey. 



Unio Lindsleyi. Testa, laevi, elliptica, compressa, ad latere planulata, valde 

 inaequilaterali, postice subbiangulata, antice oblique rotundata ; valvulis ^sub- 

 crassis, antice crassioribus; natibus prominulis ; epidermide vel luteavel 

 luteo-oliva, micante, undique virido-maculata. ; dentibus cardinalibus parvius- 

 culis, compresso-conicis crenulatisque; lateralibus longis, crassis curvisque; 

 margarita alba et iridescente. 



j{ a j K Tennessee, President J. B. Lindsley. 



Unio pekpictus. Testa laevi, elliptica, subinflata, valde inaequilaterali, pos- 

 tice obtuse biangulata, antice rotundata; valvulis tenuibus, diaphanis, antice 

 crassioribus ; natibus prominulis, ad apices undulatis ; epidermide luteo-oliva 

 subnitida, undique virido-radiata ; dentibus cardinalibus parvis, erectis, co- 

 nicis, crenulatis, in utroque valvulo duplicibus ; lateralibus longis lamellatis 

 rectisque; margarita caeruleo-alba, et valde iridescente. 



Hah. Bull River, Tennessee, President Estabrook, and Holston River, Prof. 

 Troost. 



Unio Eightsii. Testa plicata., quadrata, subcompressa, maxime undulata, 

 usque ad natium apices, valde inaequilaterali ; valvulis crassissimis, antice 

 crassioribus ; natibus elevatis, compressis, ad apices rugoso-undulatis ; epider- 

 mide tenebroso-fusca, eradiata, striata; dentibus cardinalibus magnis, crassis 

 et valde striatis ; lateralibus longis, crassis, lamellatis subcurvisque ; marga- 

 rita. alba et valde iridescente. 



Hab. Texas and Sabinas River, New Leon, Mexico, James Eights, M. D. 



Unio quadrans. -Testa, laevi, quadrata, valde ventricosa, subaequilaterali. 

 postice obtuse angulata, antice subtruncata, valvulis crassis, antice pauUsper 

 crassioribus ; natibus elevatis, tumidis ; epidermide tenebroso-fusca, eradiata. 

 transverse striata; dentibus cardinalibus magnis, valde compressis, striatis 

 crenulatisque ; lateralibus longis, crassis curvisque ; margarita alba et iride- 

 sccntc. 



Hub. Texas, Mr. C. M. Wheatley. 



Anodonta Kennerlyi. -Testa laevi, elliptica, subcylindracea, subventricosa, 

 valde inaequilaterali, antice, subtruncata, postice biangulata ; valvulis tenuissi- 

 mis diaphanis ; natibus vix prominentibus, ad apices exilissime undulatis ; 



[July, 



