160 PROCEEDINGS OF THE ACADEMY OF 



insequilaterali, postice exacuta, subbiangulari, antice oblique 

 rotundata ; valvulis crassiusculis ; natibus prominulis, fere termi- 

 nalibus, ad apices minute undulatis; epidermide tenebroso-fusca 

 perradiata ; dentibus cardinalibus parvis sulcatisque ; lateralibus 

 longis, rectis laniellatisque ; margarita vel alba vel purpurea et 

 valde iridescente. 



Hab. Savannah River at Governor Hamilton's, Geo. Dr. 

 Barratt. 



Unio subsquamosus. 



Testa laevi, oblongo-elliptica, compressa, ad latere planulata, 

 valde insequilaterali, postice obtuse biangulari, antice oblique 

 rotundata ; valvulis crassiusculis ; natibus parvis, prominulis, ad 

 apices rugoso-undulatis ; epidermide tenebroso-fusca, subsqua- 

 mosa, eradiata; dentibus cardinalibus parvis, sulcatis, in utroque 

 valvulo duplicibus ; lateralibus prrelongis, lamellatis subrectisque; 

 margarita alba et valde iridescente. 



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



Unio rostellum. 



Testa laevi, lata, compressa, ad latere planulata, valde inaequi- 

 laterali, postice obtuse biangulari, antice rotunda ; valvulis tenui- 

 bus ; natibus parvis ; epidermide tenebroso-fusca, obsolete radiata; 

 dentibus cardinalibus compressis, crenulatis, in utroque valvulo 

 duplicibus ; lateralibus prselongis, lamellatis rectisque ; margarita 

 vel albida vel purpurea et valde iridescente. 



Hab. Macon, Georgia. I. C. Plant. 

 Unio infuscus. 



Testa laevi, elliptica, subinflata, inasquilatcrali, postice obtuse 

 biangulari, antice rotundata; valvulis crassis, antice crassioribus; 

 natibus prominulis, ad apices parum undulatis ; epidermide tene- 

 broso-fusca, submicanti, obsolete radiata ; dentibus cardinalibus 

 subcrassis, compressis corrugatisque ; lateralibus longis, lamella- 

 tis, rugosis subcurvisque ; margarita vel salmonia vel purpura- 

 scente et valde iridescente. 



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



Unio ratus. 



Testa laevi, quadrata, subcompressa, ad latere subplanulata, 

 valde imvquilaterali, postice obtuse angulata, antice rotunda ; 

 valvulis subcrassis, antice crassioribus; natibus prominulis ; epi- 

 dermide tenebroso-olivacea, eradiata ; dentibus cardinalibus par- 



