NATURAL SCIENCES OF PHILADELPHIA. 157 



libus parviusculis, compressis, corrugatis, in utroque valvulo 

 duplicibus ; lateralibus longis, lamellatis, corrugatis subcurvisque ; 

 margarita vel salinonea vel purpurea et valde iridescentc. 



Hab. Yadkiu River, near Salisbury, N. C. C. M. Wheatley. 



TJnio brevis 



Testa laavi, subtriangulari, subcompressa, ad latere subplanulata, 

 inaequilaterali, postice obtuse biangulata, aiitice rotundata ; valvu- 

 lis crassiusculis, antice crassioribus ; natibus prominulis ; epider- 

 mide flavida, eradiata; dentibus cardinalibus parviusculis, sub- 

 corupressis, in utroque valvulo duplicibus ; lateralibus lamellatis, 

 parviusculis obliquisque ; margarita vel alba vel salmonis colore 

 tincta et valde iridesceute. 



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

 Law. 



TTnio amplus. 



Testa lasvi, oblonga, fere alata, inflata, inoequilaterali, postice 

 obtuse biangulata, antice rotundata ; valvulis crassis, antice 

 crassioribus ; natibus subprominentibus ; epidermide rufo-fusca, 

 nitida, obsolete radiata, transverse vittata ; dentibus cardinalibus 

 parviusculis, rugosis, compressis ; lateralibus proelongis, lamellatis 

 sublongisque ; margarita vel alba vel purpurea vel salmonis colore 

 tincta et valde iridescente. 



Hab. Irwin's Creek, Micklenberg Co., N. C. C. M. Wheatley. 



Unio ligatus. 



Testa lasvi, ovato-oblonga, subcompressa, inoequilaterali, postice 

 obscure biangulari, antice rotundata ; valvulis subcrassis ; natibus 

 prominulis ; epidermide tenebroso-fusca, polita, obsolete radiata, 

 transverse vittata ; dentibus cardinalibus parviusculis, corrugatis 

 et in utroque valvulo duplicibus; lateralibus longis, lamellatis, 

 corrugatis subcurvisque ; margarita vel alba vel salmonis colore 

 tincta et valde iridescente. 



Hab. Irwin's Creek, Mecklenberg Co. ; and Long Creek, Gas- 

 ton Co., N. C. C. M. Wheatley. 



Unio attenuatus. 



Testa lasvi, lata, attenuata, ad latere subcompressa, valde 

 insequilaterali, postice subbiangulari, antice oblique rotundata; 

 valvulis crassiusculis, antice parum crassioribus ; natibus promi- 

 nulis, fere terminalibus ; epidermide tenebroso-fusca, aliquando 

 nigra, radiata ; dentibus cardinalibus parvis, compressis, crenu- 



