20 



Unio dolosos. — Testa l*vi, obovata, subalata, subcompressa, ad latere pla- 

 nulata, postice et antice rotundata, valde incequilaterali ; valvulis subtenuibus : 

 natibus prominulis, ad apices minute undulatis; epidermide virido-oliva et 

 obsolete radiata; dentibus cardinalibus parvis, compressis crenulatisque : 

 lateralibus longis, lamellatis subcurvisque ; margarita albida et purpurea, pau- 

 lisper tincta et valde iridescente. 



Hub.— Alabama River, Claiborne, Alab., Judge Tait. Coosa River, B. R. 

 Showalter, M. D. 



Unio parvulus. — Testa plicatii, transversa, subinflata, ad latere compressa. 

 postice obtuse angulata, valde inasquilaterali ; valvulis tenuibus, antice pau- 

 lisper crassioribus ; natibus prominulis ; epidermide olivacea, subvirido-macu- 

 lata ; dentibus cardinalibus parvis, compressis, crenulatis, in utroque valvule 

 duplicibus ; lateralibus longis subrectisque ; margarita cserulea. et iridescente 



Hab.— Coosa River, Alab., E. R. Showalter, M. D. 



Unio plancus. — Testa lasvi, obliquo-ovata, subcompressa, postice biangulata 

 antice rotundata, valde inaequilaterali ; valvulis crassiusculis, antice paulisper 

 crassioribus; nalibus prominulis; epidermide luteo-fusca, radiata; dentibus 

 cardinalibus parvis, erectis, crenulatis, in utroque valvulo duplicibus ; laterali- 

 bus sublongis subrectisque ; margarita creruleo-alba et valde iridescente. 



Hab. — Coosa River, at Watumpka, Alab., E. R. Showalter, M. D. 



Asodonta Suowalterii. — Testa lsevi, elliptica, ventricosa, postice obtuse 

 angulata, antice rotundata, subasquilaterali ; valvulis crassiusculis, antice pau- 

 lisper crassioribus; natibus subprominentibus, ad apices minute undulatis; 

 epidermide tenebroso-fusca, obsolete radiata ; margarita vel alba vel paulisper 

 salmonis colore tincta et iridescente. 



Hab. — Coosa River, Watumpka, Alab., E. R. Showalter, M. D. 



Descriptions of Three New Species of Exotic UNIONIDjE. 

 BY ISAAC LEA. 

 [Head July 3d, I860.] 

 Unio occatos. — Testa plicata, elliptica, rugoso-occata, compressa, valde in»- 

 quilaterali, postice biangulata, antice regulariter rotundata; natibus prominu- 

 lis, valde compressis, ad apices plicis pulchris divaricatis ; epidermide luteo- 

 oliva et valde rugosa ; dentibus cardinalibus parvis, compressis, obliquis; la- 

 teralibus sublongis subcurvisque; margarita alba et valde iridiscente. 

 Hab. — Bengal, W. A. Haines. 



Anodonta Cailliaudii. — Testa laevi. rotunda, ventricosa, inequilateral i, »n- 



