NATURAL SCIENCES OP PHILADELPHIA. 191 



Descriptions of twenty-four New Species of TJNIONIDJE of the United States. 



BY ISAAC LEA. 



Unio Raleighensis. Testa laevi, infiata, valde inoequilaterali, postice ob- 

 tuse biangulata, antice rotundata ; valvulis subcrassis, antice crassioribus ; nati- 

 bus subprominentibus ; epidermide luteo-fusca vel-fusca, valde radiata ; dentibus 

 cardinalibus parviusculis, in utroque valvulo duplicibus ; lateralibus longis, 

 lamellatis subcurvisque ; margarita alba vel purpurea et iridescente. 



Hab. Neuse River, six miles east of Raleigh, N. Carolina, E. Emmons, 

 M. D. 



Unio Charlottensis. Testa laevi, elliptica, subcompressa, inaequilaterali, ad 

 latere parum planulata; valvulis subtenuibus, antice crassioribus ; natibus vix 

 prominentibus ; epidermide tenebroso-fusca, eradiata; dentibus cardirialibus 

 parvissimis, compressis, valde obliquis ; lateralibus parviusculis, lamellatis et 

 acumiuatis ; margarita albida et iridescente. 



Hal. Near Charlotte, Mecklenberg County, N. Carolina, E. Emmons, M. D. 



Unio Mecklenbergensis. Testa laevi, elliptica, subcompressa, inaequilaterali, 

 ad latere parum planulata, postice biangulata, antice rotundata ; valvulis crassis, 

 antice crassioribus ; natibus prominulis ; epidermide tenebroso-fusca, obsolete ra- 

 diata ; dentibus cardinalibus subgrandibus, striatis crenulatisque ; lateralibus 

 longis, lamellatis corrugatisque ; margarita albida vel purpurea et valde iri- 

 descente. 



Hab. Near Charlotte, Mecklenberg County, N. Carolina, E. Emmons, M. D. 



Unio Gastonensis. Testa, laevi, subelliptica, valde inaequilaterali, ad latere 

 planulata, postice vix biangulata, antice rotunda ; valvulis crassiusculis, an-, 

 tice crassioribus ; natibus prominulis ; epidermide tenebroso-fusca, eradiata ; 

 dentibus cardinalibus parviusculis, in valvulo sinistro tiipartitibus ; lateralibus 

 longis, lamellatis subcurvisque ; margarita purpurescente et iridescente. 



Hab. Mine Creek, Gaston County, N. Carolina, C. M. Wheatley. 



Unio Weidonensis. Testa laevi, elliptica, subinflata, sublenticular!, postice 

 subbiangulata, antice rotunda ; valvulis subcrasssis, antice parum crassioribus ; 

 natibus subprominentibus ; epidermide tenebroso-fusca vel virido-fusca, radi- 

 ata ; dentibus cardinalibus parviusculis, crenulatis, in utroque valvulo duplici- 

 bus ; lateralibus, prselongis, lamellatis subcurvisque; margarita alba vel pur- 

 purea et iridescente. 



Hab. Roanoke River, at Weldon, N. Carolina, E. Emmons, M. D. 



Unio aberrans. Testa laevi, oblonga, subinflata, valde inaequilaterali, ad 

 latere planulata, postice obtuse biangulata, antice rotundata ; valvulis crassi- 

 usculis, antice crassioribus ; natibus subprominentibus ; epidermide luteo- 

 fusca, valde radiata; dentibus cardinalibus parvis, in utroque valvulo duplicibus ; 

 lateralibus longis, lamellatis subrectisque ; magarita, caeruleo-alba, vel purpu- 

 rea et iridescente. 



Hab. Neuse River, six miles east of Raleigh, N. Carolina, E. Emmons. 

 M. D. 



Unio Chathamensis. Testa laevi, lato-elliptica, subcompressa. valde. inaequi- 

 laterali, postice obtuse biangulata, antice rotundata ; valvulis subtenuibus, an- 

 tice parum crassioribus ; natibus prominulis ; epidermide tenebroso-fusca vel 

 tenebrosa, viridi, radiata ; dentibus cardinalibus parvis, crenulatis, in utroque 

 valvulo duplicibus ; lateralibus longis, lamellatis subrectisque ; margarita alba 

 vel purpurea et valde iridescente. 



Hab. Rocky River, Chatham County, N. Carolina, E. Emmons, M. D.; and 

 James River, near Richmond, Major Le Conte. 



Unio mediocris. Testa, laevi, lato-elliptica, subinflata, valde inEequilaterali' 

 1863.] 



