29 



Descriptions of twelve new species of UNIONES, from Alabama. 

 BY ISAAC LEA. 

 (Read March 5th, 1861.) 



U.vio negates. — Testa sulcata, subtriangulari. compressa, ad latere planu- 

 lata, postice obtuse angulata, antice rotunda, subaequilaterali ; valvulis sub- 

 crassis, antice crassioribus ; natibus subprominentibus, acuminatis, ad apices 

 corrugatis ; epidermide rufo-fusca, obsolete radiata ; dentibus cardinalibus sub- 

 grandibus. striatis crenulatisque ; lateralibus subcrassis, sublongis subrectisque : 

 margarita vel alba vel rosacea et iridescente. 



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

 Mississippi. W. Spillman, M. D. 



Unio glandaceos. — Testa laevi, subtriaDgulari, inflata, inaequilaterali, postice 

 subtriangulatii, antice rotundata ; valvulis crassis, antice crassioribus ; natibus 

 prominulis, crassis ; epidermide glandacea, rugosa, eradiata ; dentibus cardi- 

 nalibus magnis, valde sulcatis, erectis ; lateralibus curlis, crassis, corrugatis. 

 obliquis subrectisque ; margarita alba et iridescente. 



Hab. — Cahawba River, Alabama. E. R. Showalter, M. D. 



I'nio isstructcs. — Testa laevi, subtriangulari, subcompressa, inaequilaterali, 

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

 bus : natibus prominentibus, ad apices rugoso undulatis ; epidermide niellea, 

 erillissime striata, eradiata ; dentibus cardinalibus parviusculis, striatis crenu- 

 latisque ; lateralibus subcurtis, striatis, obliquis subrectisque ; margarita ar- 

 gentea et iridescente. 



Hab. — Cabawba River, Alabama. E. R. Showalter, M. D. 



L'mo trivacrus. — Testa laevi, triangulari, ad umbones tumida, inaequilaterali, 

 postice angulata, antice oblique rotundata; valvulis crassis, antice et postice 

 crassioribus ; natibus prominentibus, tumidis ; epidermide fusco-virente, obso- 

 lete radiata, striata, dentibus cardinalibus parviusculis, depressis striatisque : 

 lateralibus subcurtis, percrassis, obliquis, corrugatis rectisque ; margarita ar- 

 gentea et iridescente. 



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



Unio STABILI3. — Testa laevi, triangulari, valde tumida, valde inaequilaterali. 

 postice jubbiaiigulari, antice rotundata, valvulis percrassis, antice crassioribus : 

 natibus valde prominentibus, tumidis, solidissimis, incurvis ; epidermide pal- 

 lido-mellea, eradiata, inferne striata; dentibus cardinalibus crassiusculis, com- 



