NATURAL SCIENCES OF PHILADELPHIA. 171 



Hab. Flat Rock Creek and Bull Creek, Georgia, G. Hallenbeck ; and Chatta- 

 hoochee River, near Columbus, Georgia. Bishop Elliott. 



Unio modicellus. Testa laevi, subobliqua., inflata, postice subbiangulata, 

 insquilaterali; valvulis subcrassis, antice crassioribus natibus prominentibus ; 

 epidermide vel lutea. vel luteo-oliva, obsolete radiata; dentibus cardinalibus 

 parvis, compresso-conicis, crenulatis, in utroque valvulo duplicibus ; lateralibus 

 curtis, crassis, subrectisque; margarita alba, postice aurea et iridescente. 



Hab, Connasauga River. Bishop Elliott, and Chattanooga River, Georgia. 

 T. Stewardson, M. D. 



Unio latds. Testa laevi, transversa compressa, postice obtuse angulata, 

 valde inaequilaterali; valvulis subtenuibus ; natibus prominulis ; epidermide 

 luteola vel luteo-fusca, micante et perradiata ; dentibus cardinalibus parvis. 

 subcompressis, striatis ; lateralibus praslongis, lamellatis subrectisque; mar- 

 garita vel alba, vel purpurascente vel salmonis colore tincta et valde iridescente. 



Hab. Savannah River, near Savannah, Georgia. Rev. G. White and Major 

 Le Conte. 



Unio verdtus. Testa la?vi, transversa, subinflata, ad latere planulata, 

 postice obtuse angulata, antice rotundata et valde inaequilaterali; valvulis 

 crassiusculis, antice paulisper crassioribus; natibus prominulis, -ad apices 

 crebre undulatis ; epidermide rufo-fusca, radiata vel eradiata ; dentib is cardi- 

 nalibus subgrandibus, corapressis subelevatis, striatis, in utroque valvulo 

 duplicibus: lateralibus praelongis, lamellatis, subcrassis subcurvisque ; mar- 

 garita vel alba vel salmonia vel purpurascente et valde iridescente. 



Hab. Flat Rock Creek, near Columbus, Georgia.. G. Hallenbeck. 



Unio Johannis. Testa, obliquo-elliptica, subinflata., postice obtuse angulata, 

 valde inaequilaterali ; valvulis subcrassis, antice crassioribus ; natibus subele- 

 vatis; epidermide tenebroso-viridi, ad umbones micante, postice lutea ; dentibus 

 cardinalibus subcrassis, compressis, suberectis ; lateralibus curtis, rectis, sub- 

 crassis corrugatisque ; margarita alba et valde iridescente. 



Hab. Connasauga River. Bishop Elliott; and Etowah River, Georgia. 

 Rev. G. White. Alabama River. Dr. Budd. 



Unio Raensis. Testa laevi, oblonga, subinflata, ad latere subimpressa, 

 postice tumida. et biangulata, valde inaequilaterali, ad basim emarginata ; 

 valvulis subcrassis: natibus prominulis; epidermide rufo-fusca, substriatu, 

 obsolete radiata; dentibus cardinalibus parvis, valde crenulatis; lateralibus 

 praektngis curvisque ; margarita purpurea et iridescente. 



Hab. Chattahoochee, near Columbus, and Rae's Creek, Georgia. Bishop 

 Elliott. 



Unio inusitatis. Testa, laevi, oblonga, subcompressa, ad latere planulata et 

 contracts, postice obtuse biangulata, valde inaequilaterali; valvulis crasrius ;ulis: 

 natibus prominulis, ad apices minute undulata ; epidermide lutea et fusca, 

 superne glabra, inferne tenebroso-striata, obsolete radiata; dentibus cardinali- 

 bus parvis, accuminatis, crenulatis, in utroque valvulo duplicibus; latenlibus 

 longis, lamellatis subrectisque; margarita vel alba, vel purpurea, vel salmonis 

 colore tincta et valde iridescente. 



Hab. Swift Creek, below Macon, Georgia. Bishop Elliott. 



Unio Jonesii. Testa laevi, elliptica, subinflata, valde inaequilaterali, postiee 

 obtuse angulata; valvulis subtenuibus, antice crassioribus; natibus promi- 

 nulis, ad apices undulatis ; epidermide lutea, radiis interuptis ; dentibus cardi- 

 nalibus parviusculis, erectis, conicis ; lateralibus sublongis, lamellatis rectis- 

 que ; margarita vel alba vel salmonis colore tincta et valde iridescente. 



Hab. Uharlee Creek, Georgia. J. Postell. 



1859.] 



