NATURAL SCIENCES OP PHILADELPHIA. 109 



Hab. Lake Nyassa, Central Africa. John Kirk, M. D., of the Zambezi Ex- 

 pedition. 



Unio Aferula. Testa valde plicata, obliqua, subcompressa, valde inaequi- 

 laterali, antice rotunda, postice subbiangulata ; valvulis crassiusculis, antice 

 crassioribus ; natibus subproniinentibus, solidis, ad apices undulatis ; epider- 

 mide Iuteo-cornea ; dentibus cardinalibus parviusculis, sulcatis ; lateralibus 

 subrectis, curtis, in utroque valvulo duplicibus ; margarita dilute salmonis 

 colore tiricta et valde iridescente. 



Hab. Lake Nyassa, Central Africa. John Kirk, M. D., of the Zambezi Ex- 

 pedition. 



Spatha alata. Testa alata, sulcata, triangulari, cornpressa, valde ina?quilate- 

 rali, antice oblique rotundata, postice obtuse angulata ; valvulis crassiusculis ; 

 natibus parvis, vix prorainulis ; epidermide olivacea, nitida, obsolete radiata; 

 margarita purpurea et valde iridescente. 



Hab. Lake Nyassa, Central Africa. John Kirk, M. D., of the Zambezi Ex- 

 pedition. 



Spatha Nyassaensis. Testa subsulcata, elliptica, lenticulari, cornpressa,, 

 valde inaequilaterali, antice rotunda, postice obtuse angulata; valvulis cras- 

 siusculis; natibus parvis, vix prominulis, ad apices minute undulati-s ; epider- 

 mide rufo castanea vel luteola, obsolete radiata ; margarita purpurescente et 

 valde iridescente. 



Hab. Lake Nyassa, Central Africa. John Kirk, M. D., of the Zambezi Ex- 

 pedition. 



Spatha modesta. Testa subsulcata, transversa, subcompressa, inaequi- 

 laterali, postice et antice rotunda ; valvulis tenuibus ; natibus parvis, promi- 

 nulis, ad apices minute undulatis ; epidermide teuebroso-olivacefi, eradiata, 

 nit Ida ; margarita cEeruleo-alba, et valde iridescente. 



Hab. Fresh-waters near Mozambique, Africa. John Kirk, M. D., of the 

 Zambezi Expedition. 



Description of six new species of SUCCINEA of the United States. 



BY ISAAC LEA. 



S. Haleana. Testa, obliquo-ovata, nitida, subdiaphana, aurea, tenui ; spira 

 brevi ; suturis impressis ; anfractibus ternis, convexis ; apertura grandi, lato- 

 ovata ; labro regulariter expanso ; columella incurva. 



Hab. Alexandria, Louisiana, J. H&,le, M. D. 



S. Grosvenorii. Testa obliquo-ovata, striata, subdiaphana, straminea,tenui ; 

 spira exserta ; suturis valde impressis ; anfractibus quaternis, convexis ; aper- 

 tura subrotunda, grandiuscula ; labro expanso ; columella incurva et contorts,. 

 Hab. Santa Rita Valley, Kansas? Mr. H. C. Grosvenor; and Alexandria, 

 Louisiana, J. Hale, M. D. 



S. Moohesiana. Testa, obliquo-ovata, minute striata, opaca, albida, sub- 

 tenui ; spira. exserta; suturis impressis; anfractibus ternis, convexiusculis ; 

 apertura subrotunda; labro subexpanso ; columella incurva et contorta. 



Hab. Court House Rock, on Platte River, California route, Mr. H. Moores. 



S. Wilsonii. Testa, elongato-obliqua, valde striata, diaphana, peraurea, 

 subnitida, tenui ; spira valde exserta ; suturis valde impressis ; anfractibus 

 quaternis, convexiusculis ; apertura grandiuscula, ovata ; labro subexpanso; 

 columella, tenui, incurva et contorta. 



Hab. Near Darien, Georgia, S. W. Wilson, M. D. 



S. Forsheyi. Testa, elongato-obliqua, tenui, nitida, diaphana, subaurea 

 pertenui ; spira exserta, acuminata; suturis impressis; anfractibus ternis, 

 1864.] 



