NATURAL SCIENCES OP PHILADELPHIA. 85 



Description of Three New Exotic species of NAIADES. 

 BY ISAAC LEA. 



Unio Poetanus. Testa, laevi, transversa, subcylindracea, ad basim subemar- 

 ginata, valde inaequilaterali, ad latere planulala, postice tnincata et subbian- 

 gnlata ; valvulis subcrassis ; natibus prorninul is, ad apices siniplicibus ; epider- 

 mide luteola; dentibus cardinalibus subcompressis, accuminatis crcnulatisque ; 

 lateralibus pra;longis, lamellatis rectisque ; margarita luteola et iridescente. 



Hab. Rio de las Balsas, near Coyucan, Mexico. Prof. Poey of llavanna. 



Unio Canadensis. Testa laevi, triangular!, subcompressa, inajquilaterali, pos- 

 tice obtuse angulata ; valvulis subcrassis, antice crassioribus ; natibus sub- 

 prominentibus ; epidermide lutea, postice radiata ; dentibus cardinalibus parvis, 

 erectis crcnulatisque ; lateralibus longis, curvis lamellatisque ; margarita alba 

 et iridescente. 



Hab. St. Lawrence River, near Montreal. M. Carey Lea. 



Anodonta IIoltonis. Testa bcvi, oblonga, inflata, valde inaequilaterali, e nat- 

 ibus lincatis ; valvulis subcrassis; natibus subprominentibus ; epidermide 

 tenebroso-olivacea, stria'a; margarita coerulea et iridescente. 



Hab. Near Cauca River, Province of Popayan, S. A. Rev. J. F. Holton. 



Description of Twelve New Species of NAIADES from North Carolina. 

 BY ISAAC LEA. 



Unio Wheatleyi. Testa lasvi, quadrata, subinflata, ad latere planulata, sub- 

 emarginata, valde ina>quilaterali ; valvulis subcrassis; natibus prominulis : 

 epidermide tenebroso-fusca ; dentibus cardinalibus curtis, subcrassis, in utroque 

 valvulo duplicibus ; lateralibus subcrassis, praelongis subrectisque ; marginata 

 vel alba vel purpurea et iridescente. 



Hab. Catawba River, Gaston Co., N. C. C. M. Wheatley. 



Unio percoarctatds. Testa Isevi, quadrata, valde coarctata ad latere planulata 

 valvulis tenuibus, postice subbiangulata; natibus vix prominetitibus, ad apices 

 undulatis ; epidermide tenebroso-fusca, minute et valde striata ; dentibus car- 

 dinalibus parvis, striatis, in utroque valvulo duplicibus ; lateralibus praelongis, 

 lamellatis rectisque; margarita purpurea, et valde iridescente. 



Hab. Catawba River, Gaston Co., N. C. C. M. Wheatley and F. A. Gcnth. 

 M. D. 



Unio gracilentus. Testa laevi, valde transversa, valde compressu, ad latere plan- 

 ulata, valde inajquilaterali, postice obtuse angulata ; valvulis tenuibus ; natibus 

 vix prominentibus, ad apices undulatis ; epidermide tenebroso-fusca, postice ob- 

 solete radiata ; dentibus cardinalibus parvis, crenulatis, in utroque valvulo du- 

 plicibus ; lateralibus praelongis, lamellatis rectisque ; margarita coeruleo-albfc et 

 valde iridescente. 



Hab. Catawba River, Gaston Co., N. C. C. M. Wheatley. 



Unio micans. Testa laevi, elliptica, subcompressS., valde inEequilaterali, postice 

 angulata ; valvulis subtenuibus, postice crassioribus ; natibus prominulis ; epi- 

 dermide luteo-fusca, valde radiata et valde micante; dentibus cardinalibus 

 parvis, compressis, erectis crcnulatisque ; lateralibus longis, lamellatis rec- 

 tisque; margarita vel alb4 vel salmonis colore tincta et valde iridescente. 



Hab. Catawba River, Gaston Co., N. C. C. M. Wheatley and F. A. Genth, 

 VL D. Deep River Gulf, N. C. Prof. Emmons. 



Unio Genthii. Testa laevi, obliqufi,, inflata, injequilaterali, postice obtuse an- 

 gulata ; valvulis subcrassis, antice crassioribus; natibus prominentibus ; epider- 

 mide tenebroso-fusca, obsolete radiat& ; dentibus cardinalibus subgrandibns, 



1857.] 



