24 



•ouipressis, crenulatis, acuminatis ; lateralibas tenuibus subcurvisque: mar- 

 g.arita purpurascente et valde iridescente. 



Hah — Coosa River, Alabama. E. R. Showalter, M. D. 



Unio Lewisii. — Testa laevi, subrotunda, suborbiculari, subiequilaterali ; val- 

 vulis crassissirais, antice crassioribus ; natibus elevatis, tumidis incurvisque ; 

 epidermide luteola, punctata; dentibus cardinalibus crassissimis, erectis crenu- 

 latisque ; lateralibus crassissimis, brevibus et obliquis ; margarita alba et irides- 

 cente. 



Hah. — Coosa River, Alabama. E. R. Showalter, M. D. 



Unio medius. — Testa lasvi, obliqua, valde inflata, valde ina;quilaterali, postice 

 obtuse angulata, antice oblique rotundata ; valvulis crassis, postice crassiori- 

 bus ; natibus elevatis, tumidis; epidermide fused, raaculata, inferne striata, 

 superne micante ; dentibus cardinalibus crassis, pyramidatis crenulatisque ; 

 lateralibus crassis, rectis brevibusque ; margarita argentea et iridescente. 



Huh. — Coosa River, Alabama. E. R. Showalter, M. D. 



\Inio concolob. — Testa laevi, oblique elliptic^, subinflata, inajquilaterali. 

 postice subhiangulata, antice rotunda; valvulis subcrassis, antice crassioribus : 

 natibus subprominentibus; epidermide tenebroso-oliva, eradiata, ad umbones 

 nitida, inferne striata; dentibus cardinalibus crassiusculis, erectis, obtuse corc- 

 nressis ; lateralibus sublongis, obliquis suhrectisque ; margarita alba et irides- 

 cente. 



Hah. — Big Prairie Creek, Alabama. E. R. Showalter, M. D. 



Unio verds. — Testa laevi, subtriangulari, subcompressa, valde inaequilaterali, 

 postice fere rotunda, antice rotunda ; valvulis crassiusculis, antice crassiori- 

 bus ; natibus elevatis : epidermide teuebro30-olivi, eradiata, maculata, vittata, 

 ad umbones micante, inferne striata ; dentibus cardinalibus parviusculis, conn 

 uresso-pyramidatis striatisque ; lateralibus, subbrevibus, obliquis subrectisque ; 

 margarita alba, et iridescente. 



Hah. — Cahawba River, Perry Co., Alabama. E. R. Showalter, M. D. 



Unio asperatus. — Testa valde tuberculatum, subrotunda, inflata, antice et 

 postice rotunda, subequilaterali ; valvulis crassis, antice crassioribus ; natibus 

 valde prominentibus; epidermide rufo-lutea, eradiata; dentibus cardinalibus 

 percrassis, obtuso-conicis, corrugatis ; lateralibus brevissimis, valde obliquis 

 rectisque ; margarita argentea et iridescente. 



Hab. — Alabama River, Claiborne, Alabama. Judge Tait. 



Unio ornatus. — Testa laevi, subrotunda, compressa, inaequilaterali, postice 

 subrotunda, antice rotunda ; valvulis crassiusculis, antice crassioribus ; nati- 



