NATURAL SCIENCES OP PHILADELPHIA. 189 



DESCRIPTIONS OF TWENTY NEW SPECIES OF TJNIONES OF THE UNITED 



STATES. 



BY ISAAC LEA. 

 TJnio lawii. 



Testa laevi, obliqua, clavfeformi, antice tumida, valde insequi- 

 laterali, postice obtuse angulata; valvulis crassis, antice aliquanto 

 crassioribus ; natibus prominentibus, fere teriniualibus ; epider- 

 mide flavida, radiis interruptis iudutis ; deutibus cardinalibus 

 parviusculis, acuminatis creuulatisque ; lateralibus sublongis, 

 subcurvis lamellatisque ; margarita argentea et iridesceute. 



Hah. Tennessee River, Tuscumbia, Alab., B. Pybas. Tenn. 

 River, Dr. Edgar. Holston River, Miss A. E. Law and Prof. 

 Cope. 



Vnio appressus. 



Testa Isevi, triangulari, securiformi, valde ingequilaterali, antice 

 rotundata, postice subangulata ; valvulis crassiusculis, antice 

 aliquanto crassioribus; natibus prominentibus; epidermide flavida, 

 radiis interruptis postice indutis ; dentibus cardinalibus parvius- 

 culis, compressis creuulatisque; lateralibus sublongis, curvis lamel- 

 latisque ; margarita argentea et aliquanto iridescente, 



Hab. Tuscumbia, Alab., B. Pybas and J. G. Anthony. Holston 

 River, Miss Law and C. M. Wheatley. 



ITnio validus. 



Testa laevi, triangulari, inflata, insequilaterali, antice rotunda, 

 postice obtuse angulata ; valvulis crassis, antice aliquanto crassi- 

 oribus ; natibus prominentibus, ad apices undulatis ; epidermide 

 olivacea, valde radiata; dentibus cardinalibus crassis, compressis 

 creuulatisque ; lateralibus sublongis, crassis subcurvisque ; mar- 

 garita argentea et iridescente. 



Hab. Duck River, Tenn., Dr. Powell. Clinch River, Pres. 

 Estabrook. Holston River, Dr. Edgar and Miss Law. 



Unio litus. 



Testa Isevi, elliptica, subcompressa, ingequilaterali, antice rotun- 

 data, postice subbiangulata ; valvulis subtenuibus, antice crassi- 

 oribus ; natibus prominulis ; epidermide crocea, eradiata ; dentibus 

 cardinalibus parvis compressisque ; lateralibus sublongis, sub- 

 1871.] 



