17 



Descriptions of Two New Species of UNIONES from Georgia. 

 BY ISAAC LEA. 

 [Read July 3d, 1S60.] 



Umo lingceformis. — Testa laevi, elliptic;*!, compresf a, ad latere planulata, 

 insequilaterali, postice obtuse biangulata, antice rotnndata, valvulis subte- 

 nuibus, antice crassioribus ; natibus prominulis; epidermide pallido-lutea, 

 subnitida, viridi-radiata, dentibus cardioalibus parvinsculis, obtuso-conicis, 

 crenulatis, in utroque valvulo duplicibus ; lateralibus sublongis, lamellatis 

 subcurvisque ; margarita alba et valde iridescente. 



Hob. — Columbus, Georgia. 



I'sio dispak. — Testa laevi, elliptica, subinflata, ad latere paulisper plannlati. 

 valde inaequilaterali, postice obtuse angulata, antice rotundata; valvulis snb- 

 crassis : natibus prominulis, ad apices undulatis ; epidermide vel lutea vel 

 olira et valde radiata ; dentibus cardinalibus parviusculis, compressis, in 

 utroque valvulo duplicibus, erectis, crenulatis ; lateralibus longis, lamellatis 

 curvisque, margarita alba et iridescente. 



Holy. — Columbus, Georgia, Bishop Elliott and G. Hallenbeck. 



Descriptions of Three New Species of UNIONES from Mexico. 

 BY ISAAC LEA. 

 [Read July 3d, I860.] 



t r Nio Cocchianus. — Testa laevi, quadrata, inflata, biemarginata, ad latere sul- 

 fa*:"., inaequilaterali, postice biangulata, antice rotunda ; valvulis crassis, antice 

 '•ra33sioribus ; natibus prominentibus : epidermide olivo-fusca, striata., eradi- 

 ata; dentibus cardinalibus subgrandibus, erectis, rugoso-striatis, crenulatis; 

 lateralibus sublongis, crassis curvisque ; margarita argentea et valde irides- 

 cente. 



Hah. — Rio Salado, New Leon, Mexico, L. Berlandier, M. D. 



(Trio Saladoensis. — Testa laevi, obovata, inflata, inaequilaterali, posticd ct 

 antice rotnndata; valvulis subtenuibus, antice paulisper crassioribus ; natibus 

 prominulis. lavibus ; epidermide luteo-olivi, polita radiataque ; dentibus 

 cardinalibus parvis, lamellatis, obliquis ; lateralibus sublongis, lamellatis sub- 

 curvisque ; margarita csruleo-alba et iridescente. 



Ifali.—R\a Salado, New Leon, Mexico, L. Berlandier, M. D. 



