192 PROCEEDINGS OP THE ACADEMY OF 



TJnio recurvatus. 



Testa Itevi, rotundata, valde inflata, valde inagquilaterali ; an- 

 tice rotundata, postice obtuse augulata ; valvulis crassis, antice 

 crassioribus; natibiis valde prominentibus et recurvatis; epider- 

 mide fusca, eradiata ; dentibus cardinalibus parvis, crassis sulca- 

 tisque ; lateralibus percrassis, curtis, subcurvis corrugatisque ; 

 marofarita aroentea et iridescente. 



Hah. Tenn. River, J. G. Anthony. Holston River, E. Tenn., 

 Miss Law. 



TJnio obuncus. 



Testa losvi, triangulari, subinflata, ad basim arcuata, insequi- 

 laterali, antice rotunda, postice obtuse angulata ; valvulis crassis, 

 antice crassioribus ; natibus prominentibus ; epidermide dilute 

 oliva, perradiata; dentibus cardinalibus parvis corrugatisque; 

 lateralibus crassis, lamellatis corrugatisque ; margarita argentea 

 et iridescente. 



Bab. Tuscumbia, Alab. Holston River, E. Tenn., Miss Law. 



TJnio radiosus. 



Testa Ifevi, subtriangulari, subinflata, subequilaterali, antice 

 rotundata, postice obtuse angulari; valvulis crassiusculis, antice 

 parum crassioribus ; natibus prominentibus ; epidermide luteo- 

 oliva, perradiata; dentibus cardinalibus parvis, compressis crenu- 

 latisque ; lateralibus subcrassis, lamellatis subrectisque; margarita 

 alba et iridescente. 



Hah. Holston River, E. Tenn., C. M, Wlieatley and Miss Law. 



TJnio circumactus. 



Testa Iffivi, rotundata, ad apices inflata, ad basim compressa, 

 inffiquilaterali ; valvulis crassis, antice crassioribus; natibus ele- 

 vatis recurvatisque ; epidermide vel rufo-fusca vel castanea, raacu- 

 lata et radiata ; dentibus cardinalibus crassis, subcompressis 

 sulcatisque ; lateralibus percrassis, subcurvis corrugatisque ; mar- 

 garita argentea et valde iridescente. 



Hah. Florence, Alab., Rev. G. White. Holston River, Miss 

 Law. 



TJnio radiolus. 



Testa laevi, elliptica, subinflata, valde inrequilaterali, antice 

 rotunda, postice obtuse angulata; valvulis crassiusculis; natibus 

 prominulis, fere terminalibus ; epidermide brunnea, valde radiata; 



[October 24, 



