158 PROCEEDINGS OP THE ACADEMY OP 



latis, obliquis, in utroque valvulo duplicibus ; lateralibus prse- 

 longis, lamellatis subrectisque ; margarita alba et valde irides- 

 cente. 



Hab. Savannah River, Geo., Dr. Barratt ; and Beaver Creek, 

 Houston Co., Georgia, Dr. J. Lewis. 



Unio differtus. 



Testa loevi, elliptica, ventricosa, subaaquilaterali, postice obtuse 

 biangulari fere rotunda, antice rotundata ; valvulis crassis, antice 

 crassioribus ; natibus vix prominulis ; epidermide subpolita, luteo- 

 la et obsolete radiata ; dentibus cardinalibus parviusculis, corru- 

 gatis, compressis et in utroque valvulo duplicibus ; lateralibus 

 lougis, lamellatis subrectisque ; margarita vel albida vel salmonis 

 colore tincta et valde h'idescente. 



Hab. Georgia ? Major J. LeConte. 



Unio strumosus. 



Testa lsevi, rotundata, inflata inrequilaterali, postice obtuse 

 angulata, antice rotundata ; valvulis crassis ; natibus prominulis ; 

 epidermide tenebroso-fusca vel nigra, eradiata; dentibus cardi- 

 nalibus subgrandibus, rugosis, in utroque valvulo duplicibus ; 

 lateralibus, longis, rugosis et curvatis ; margarita alba et irides- 

 cente. 



Hab. Yadkin River, N. C. C. M. Wheatley. 



Unio subparallelus. 



Testa lsevi, oblonga, subcompressa, ad latere planulata, insequi- 

 laterali, postice subangulari, antice rotundata ; valvulis crassius- 

 culis, antice parum crassioribus ; natibus prominulis, ad apices 

 concentrico-rugoso-undulatis ; epidermide tenebi*oso-fusca, nitida, 

 radiata; dentibus cardinalibus parviusculis, conicis, rugosis, in 

 utroque valvulo duplicibus ; lateralibus prselongis, lamellatis 

 subcurvisque ; margarita salmonis colore tincta. 



Hab. Irwin's Creek and Fox River, N. C. C. M. "Wheatley. 



Unio oblongus. 



Testa lsevi, oblonga, compressa, ad latere planulata ; valde 

 insequilaterali ; valvulis parum crassioribus; natibus prominulis ; 

 epidermide luteola, micanti, radiata vel eradiata ; dentibus cardi- 

 nalibus parvis, lobatis, corrugatis, in utroque valvulo duplicibus; 

 lateralibus prrelongis subrectisque; margarita alba vel purpura- 

 scenti vel salmonis colore tincta et iridescente. 



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



