188 PROCEEDINGS OF THE ACADEMY OP 



DESCRIPTION OF THREE NEW SPECIES OF EXOTIC UNIONIDJE. 



BY ISAAC LEA. 

 Unio JeiFreysianus. 



Testa crebre et leviter sulcata, regal ariter elliptica, compressa, 

 parum insequilaterali; valvulis crassiusculis, antice parum crassi- 

 oribus; natibus prominulis ; epidermide tenebroso-fusca, polita, 

 evadiata; dentibus cardinalibiis parvis, lamellatis, obliquis; lateral- 

 ibus loiigis, lamellatis subrectis et in utvoqiie valvule simplicibus ; 

 margarita vel alba vel salmonis colore tincta. 



Hah. Australia, C. M. Wheatley. 



Unio Stevensii. 



Testa bialata, valde plicata, triangulari, compressa, valde inae- 

 quilaterali; valvulis crassiusculis; antice crassioribus; natibus 

 vix promineutibus; epidermide tenebroso-coruea, eradiata; denti- 

 bus cardinalibus parvis sulcatisque; lateralibus longis, lamellatis 

 subcurvisque; margarita alba et iridescente. 



Hah. Yuruari River, Tributary to Essequebo River, Guiana, 

 R. P. Stevens. 



Anodonta ezilior. 



Testa alata, Irevi, obovata, inflata, valde injequilaterali; valvulis 

 exilissimis ; natibus prominulis, ad apices minute undulata ; epi- 

 dermide vel olivacea vel brunnea, polita et eradiata; margarita 

 coerulea et valde iridescente. 



Hah. Mexico, C. M. Wheatley. 



[October 24, 



