NATURAL SCIENCES OF PHILADELPHIA. 113 



anfractibus subplanulatis ; fissura parviuscula; apertura parva, elliptic^,, in- 

 tus alba ; labro acuto, aliquanto sinuoso ; columella, inferne ct superue iacraa- 



sat.', . 

 Hab. Coosa River, Alabama, E. R. Showalter, M. D. 



Description of five new Species of LYMN2EA of North America. 



BY ISAAC LEA. 



LtmSjEA S.mithsoxiana. -Testa fusiformi, rufo-fuscescente, subdiaphana, pa- 

 rum perforata, excellissimc transverse striata ; spira obtusa ; suturis imprcssis ; 

 anfractibus senis, convexis ; apertura grandiuscula, ovata, submargineoi fusca ; 

 labro expanso ; columella parum incrassata, et vix plicata. 



Hab. Loup Fork of the Platte River, F. V. Hayden, M. D., Surg. IT. S. Army. 



Lym.wea Tgaskii Testa fusiformi, tenui, delute fusca, subdiaphana, parum 

 perforata, minutissime striata, nitida ; spira conoidea ; suturis impressis ; an- 

 fractibus quinis, convexiusculis ; apertura parviuscula, ovata ; sub marginem 

 fusca ; labro subexpanso ; columella incrassata et plicata. 



Hub. San Antonio Arroya, John B. Trask, M. D. 



Lvmnjea Jamesii. Testa subturrita, tenuissima, albida, diaphana, perforata, 

 striis rectis indutis; spira exserta. ; suturis valde impressis; anfractibus quinis, 

 convexis; apertura grandiuscula, subrotundata, ; labro expanso; columella, 

 tiliquauto plicata. 



Hab. Ponds near Cincinnati, Ohio, IT. P. James, Esq. ; and La Fayette, 

 Walker Co., Georgia, Rev. Geo. White. 



Lymn.ea Lecontii. Testa inflata, subcrassa, perforata, excellissime trans- 

 verse striata ; spira obtusa ; suturis valde impressis ; anfractibus valde con- 

 vexis ; apertura subrotunda, grandiuscula ; labro expanso ; columella medio 

 incrassata et impressa. 



Hab. Georgia, Major John LeConte. 



Lymn.ea Arctica. Testa elliptica, subinflaia, subcrassa, imperforata, minute 

 striata, dilute cornea ; spira obtusa ; suturis impressis : anfractibus convexis; 

 apertura lato-elliptica, subgrandi ; labro regulariter expanso ; columella medio 

 incrassata" et magna plica induta. 



Hab. Moose River of Hudson's Bay, Arctic America, Smithsonian Institu- 

 tion. 



Descriptions of two new Species of UNIONIDJE from South Africa. 



BY ISAAC LEA. 



Siwtha Natalensis. Testa subsulcata, oblonga, compressa, subnitida, valde 

 insequilaterali, ad latere planulata, antice rotunda, postice rotnndata ; valvulis 

 crassiusculis, antice aliquanto crassioribus ; natibus vix prominulis, ad apices 

 minute undnlatis; epidermide teuebroso-rufo-fusca, eradiata ; margaiita, pur- 

 purea et valde iridescente. 



Hab. Umpingave River, Port Natal, South Africa, Rev. J. McKen. 



Uxio Natalensis. Testa plicata, antice sulcata, oblonga, ad latere plann- 

 Iat3 valde insequilaterali, antice rotundata, postice obtuse angulata ; valvulis 

 subcrassis, antice aliquanto crassioribus ; natibus subprominentibus, acumi- 

 natis, ad apices undulatis; epidermide luteola, eradiata ; dentibus cardinalibus 

 eompressis, obliquis corrugati-que ; lateralibus longis, lamellatis subrectisque ; 

 margarita dilute salmonis colore tincta et valde iridescente. 



Hab. Umpingave River, Port Natal, South Africa, Rev. J. McKen. 



1861.] 8 



