NATURAL SCIENCES OF PHILADELPHIA. 155 



DESCRIPTIONS OF TWENTY-NINE SPECIES OF UNIONID.E FROM THE 



UNITED STATES. 



BY ISAAC LEA. 

 Unio Tellicoensis. 



Testa Ifevi, subtrangulari, subinflata, inasquilaterali, postice 

 obtuse angulari, antice rotunda ; valvulis crassiusculis, antice 

 parum crassioribus ; natibus subprominentibus ; epidermide cro- 

 cata, polita ; parum radiata ; dentibus cardinalibus parvis, cre- 

 nulatis, conicis ; lateralibus curtis, subcrassis subrectisque ; mar- 

 garita salrnonis colore tincta et valde iridescente. 



Eab. Tellico River, Monroe Co., E. Tenn. Miss A. E. Law. 



Unio Conasaugaensis. 



Testa lsevi, suboblonga, subinflata, inrequilaterali, postice sub- 

 biangulari, antice rotundata ; valvulis percrassis, antice crassiori- 

 bus ; natibus subprominentibus ; epidermide rufo-fusca, eradiata ; 

 dentibus cardinalibus parviusculis, subcompressis crenulatisque ; 

 lateralibus curtis, crassis, obliquis rectisque ; margarita alba et 

 aliquanto iridescente. 



Eab. Conasauga Creek, Monroe Co., E. Tenn. Miss A. E. 

 Law. 



Unio lenticularis. 



Testa laevi, subrotunda, compressa, lenticulari; subaequilaterali, 

 postice obtuse biangulari, antice rotunda ; valvulis- subtenuibus, 

 antice crassioribus; natibus prominulis; epidermide vel tenebroso- 

 fusca vel luteo-fusca, obsolete radiata; dentibus cardinalibus 

 parvis, compressis crenulatisque; lateralibus sublongis, lamellatis, 

 corrugatis subcurvatisque ; margarita albida et iridescente. 



Eab. Tellico River, Monroe Co., E. Tenn. Miss A. E. Law. 



Unio Andersonensis. 



Testa laevi, triangulari, inflata, ad latere planulata, valde 

 insequilaterali, postice obtuse angulata, antice oblique rotundata; 

 valvulis percrassis, antice crassioribus; natibus valde elevatis, 

 tumidis recurvatisque ; epidermide vel luteola vel fusca, obsolete 

 radiata; dentibus cardinalibus crassis, crenulatis, conicis; late- 

 ralibus crassis, curtis subcurvisque ; margarita argentea et irides- 

 cente. 



Eab. Holston River and Clinch River, Anderson Co., E. Tenn. 

 Miss A. E. Law. 



