172 PROCEEDINGS OF THE ACADEMY OF 



(Jnio subniger. Tests. Isevi, elliptica, subcompressa, insequilaterali, postice 

 obtuse angulata; valvulis subcrassis; natibus prominulis ; epidermide tene- 

 broso-fusca, nigricante, striata, eradiata; dentibus cardinalibus parviusculis, 

 erectis, conicis crenulatisque ; lateralibus praelongis, lamellatis curvisque ; 

 margarita alba et iridescente. 



Hub. Flint River, near Macon, Georgia. I. C. Plant. 



tlNio BULBOSus. Testa laevi, obliqua, valde inflata, valde inEequilaterali, 



postice obtuse angulata ; valvulis crassis, antice crassioribus, natibus : 



epidermide nigricante, micante, eradiata; dentibus cardinalibus subgrandibus, 

 subpyramidatis crenulatisque ; lateralibus curtis, subcrassis subrectisque ; mar- 

 garita vel alba vel salmonis colore tincta et iridescente. 



Hab. Flint River, near Macon, Georgia. I. C. Plant and H. M. Neisler, M.D. 



Unio Maconensis. Testa lasvi, valde transversa, subcompressa, ad latere 

 planulata, valde insequilaterali, postice subbiangulata ; valvulis subtenuibus ; 

 natibus prominulis ; epidermide nigricante, obsolete radiata ; dentibus cardi- 

 nalibus parviusculis, compressis, acuminatis, crenulati?, in utroque valvule 

 duplicibus ; lateralibus praelongis, lamellatis rectisque; margarita purpurascente 

 et iridescente. 



Hab. Flint River, near Macon, Georgia. I. C. Plant. 



Unio obfitscus. Testa Isevi, regulariter elliptica, inflata, postice rotundata, 

 inaequilaterali ; valvulis subtenuibus; natibus subprominentibus; epidermide 

 tenebroso-fusca, nigricante, obsolete radiata, subpolita: dentibus cardinalibus 

 subcompressis, crenulatis, in utroque valvule duplicibus ; lateralibus lamellatis, 

 sublongis subcurvisque ; margarita paulisper salmonis et valde iridescente. 



Hab. Flint River, near Macon, Georgia. I. C. Plant. 



Unio aquilus. Testa Isevi, transversa, subcompressa, postice angulata, valde 

 inaequilaterali ; valvulis crassiusculis ; natibus prominulis, ad apices rugoso- 

 undulata ; epidermide tenebroso-fusca, nigricante, obsolete radiata, transverse 

 striata ; dentibus cardinalibus parviusculis, subelevatis crenulatisque : laterali- 

 bus przelongis, lamellatis subrectisque ; margarita vel purpurea vel alba et 

 valde iridescente. 



Hab. Flint River, near Macon, Georgia. I. C. Plant. 



[June, 



