40 PROCEEDINGS OP THE ACADEMY OP 



bus ; lateralibus sublongis, lainellatis subrectisque ; margarita alba et irides- 

 cente. 

 Hab. Stream near Columbus, Mississippi. W. Spillman, M. D. 



Unio anaticulus, Testa, laevi, obliqua, ad umbones valde tumida, antice 

 truncata, postice obtuse angulata, valde inaequilaterali ; valvulis crassiusculis, 

 antice crassioribus ; natibus elevatis, crassis, incurvis, fere terminalibus ; epi- 

 dermide castanea, vittata, obsolete radiata, dentibus cardinalibus subcrassis, 

 subpyramidatis crenulatisque ; lateralibus crassis, obliquis subrectisque; mar- 

 garita argentea et iridescente. 



Hab. Near Columbus, Mississippi. W. Spillman, M. D. 



Unio kubidus. Testa sulcata, subtriangulnri, valde inflata, ad latere planu- 

 lata, subaequilaterali, valvulis subcrassis, antice crassioribus; natibus subpro- 

 minentibus, subiuflatis; epidermide tenebroso-rufo-fusca,, eradiata, superne mi- 

 canti, inferne striata; dentibus cardinalibus crassiusculis, elevatis, subpyrami- 

 datis crenulatisque ; lateralibus sublongis, curvis subcrassisque ; margarita 

 vel rosacea vel alba vel salmonis colore tincta et iridescente. 



Hab. Tombigbee River, Mississippi. W. Spillman, M. D, ; Coosa River and 

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



Unio decumbens. Testa, laevi, arcuata, valde compressa, ad latere planulata. 

 inaequilaterali, postice biangulata, antice rotunda; valvulis subtenuibus, antice 

 et postice paulisper crassioribus ; natibus prominulis ; epidermide tenebroso-rufo- 

 fasca, obsolete radiata, transverse striata ; dentibus cardinalibus minimis, sub- 

 compressis, in utroque valvulo duplicibus ; lateralibus prailongis, arcuatis ; 

 margarita purpurascente, et valde iridescente. 



Hab. Alabama. E. R. Showalter, M. D. 



Unio germanus. Testa, laevi, elliptica, subinflata, inaequilaterali, postice sub- 

 biangulata. antice rotunda; valvulis crassiusculis, antice crassioribus ; natibus 

 subpromineutibus, ad apices concentrice rugoso-undulatis ; epidermide tene- 

 broso-fusca, eradiata, transverse striata ; dentibus cardinalibus parvis, erectis, 

 compressis, creuulatis, acuminatis ; lateralibus tenuibus subcurvisque ; mar- 

 garita purpurascente et valde iridescente. 



Hab. Coosa River, Alabama. E. R. Showalter, M. D. 



Unio Lewisii. Testa laevi, subrotunda, suborbiculari, subrequilaterali ; val- 

 vulis crassissimis, antice crassioribus ; natibus elevatis, tumidis incurvisque : 

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

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

 cente. 



Hab. Coosa River, Alabama. E. R. Showalter, M. D. 



Unio medics. Testa laevi, obliqua, valde inflata,, valde inaequilaterali, postice 

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

 bus; natibus elevatis, tumidis; epidermide fusea, maculata, inferne striata, 

 superne micanti ; dentibus cardinalibus crassis, pyramidatis crenulatisque; 

 lateralibus crassis, rectis brevibusque ; margarita argentea. et iridescente. 



Hab. Near Uniontown, Alabama. E. R. Showalter, M. D. 



Unio concolor. Testa laevi, oblique elliptica, subinflata, inaequilaterali, 

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

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

 nitida, inferne striata. ; dentibus cardinalibus crassiusculis, erectis, obtuse com- 

 pressis; lateralibus sublongis, obliquis subrectisque ; margarita alba, et irides- 

 cente. 



Hab. Big Prairie Creek, Alabama. E. R. Showalter, M. D. 



Unio verus. Tes'a laevi, subtriangulari, subcompressa, valde inaequilaterali, 

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



[Feb. 



