21 



tice superne angulata ; valvulis crassis, antice paulisper crassioribus; natibus 

 elevatis, tumidis, incurvis : epidermide nigro-fusca, obsolete radiata, superne 

 micante, interne exilissime striata ; margarita argentea et valde iridescente. 

 Hab. — Brazil, Monr. F. Cailliaud. 



MrcKTOPUs emarginatus. — Testa laevi, transversissime, compressa, emargi- 

 nata, ad latere planulata, antice inflata, postice ampliata et compressor ; valvulis 

 pertenuibus, diapbinis, natibus parvis, prominulis ; epidermide luteo-cornea. 

 valde striata, nitida, eradita. ; margarita caeruleo-alba et valde iridescente. 



Bab.— Siam, S. R. House, SI. D. 



Descriptions of Twenty-rive New Species of UNIONIDiE from Georgia 

 Alabama, Mississippi, Tennessee and Florida. 



BY ISAAC LEA. 

 (Read February 5th, 1S61.) 

 Ohio fabaceus. — Testa laevi, oblonga, subquadrati, subinflatfi., postice sub- 

 biangulata, subaequilaterali ; valvulis crassiusculis, antice crassioribus ; nati- 

 bus prominulis; epidermide tenebroso-fusca, micante, obsolete radiata; denti- 

 bus cardinalibus parvis, erectis, acuminatis, crenulatis ; lateralibus curtis, la- 

 mellatis subcurvisque : margarita purpurascente, salmonis colore tinct;i et 

 valde iridescente. 

 Hab. — Oostanaula River, Georgia. Bishop Elliott. 



Unio irrascs. — Testa laevi, rotundo-trigona, inflata, postice obtuse angulatu 

 antice rotunda; valvulis subcrassis, antice crassioribus; natibus subelevatis. 

 crassis; epidermide luteo-fusci, vel obsolete radiata vel eradiata; dentibus 

 cardinalibus crassi3, elevatis, subcompressis crenulatisque ; lateralibus cnrtis. 

 crassis, obliquis rectisque : margarita argentea. et iridescente. 



Hab.— Etowah River, Georgia. Rev. G. White. 



Unio Ocmulg£ensis. — Testa laevi, transversa, inflata, postice obtuse biangu- 

 lata, antice subtrunca'a, valde inaequilaterali : valvulis crassis, antice crassi- 

 oribus ; natibus prominulis ; epidermide tenebroso-fusca, eradiata, superne 

 micante, inferne valde striata ; dentibus cardinalibus parviusculis, pyramidatis 

 striatisque ; lateralibus praelongis, lamellatis 3ubrectisque ; margarita 1 argen- 

 tea et iridescente. 



Hab. — Little Ocmulgee River, Lumber City, Georgia. S. W. Wilson, M. L). 



Unio ciccr. — Testa, laevi, oblonga, subinflata, ad latere subplanulata, postice 

 rotundata, valde inaequilaterali ; valvulis tenuibus, subdiaphanis ; natibus sub- 

 prominentibus, ad apices undulatis ; epidermide olivaGea, eradiata ; dentiluiF 



