NORTH AMERICAN CONCHOLOGT. 



3S7 



[Proceedings of tlie Acad, of Nat. 



Sci. of Philad., n. s. — continued.} 



1857. 

 Page. 



Name. 



1857. 



Page. 



Name. 



March. 



1 1 

 L.ea. — Descriptions of six new species of Uniones from Ala- 

 bama : by Isaac Lea. 



83 

 83 

 83 



Unio propinquus Lea. 

 Florentinus Lea. 

 biemarginatus Lea. 



83 



83 

 83 



Unio mundus Lea. 

 Thorntoni Lea. 

 Mooresianus Lea, 





Lea. — Descriptions of eight new species of Naiades from vari- 

 ous parts of the United States : by Isaac Lea. 



84 



84 

 84 

 84 



Unio pinguis Lea. 

 Higginsii Lea. 

 Abbevillensis Lea. 

 Jamesianus Lea. 



84 

 84 

 84 

 84 



Unio Texasiensis Lea. 

 Anodonta Le-wisii Lea. 



lacustris Lea. 



modesta Lea. 





Lea. — Descriptions of three new species of Naiades : by Isaac 

 Lea. 



85 

 85 



Unio Poeyanus Lea. 85 Unio Canadensis Lea. 



Coyucan, Mex. Montreal. 





Lea. — Descriptions of twelve new species of Naiades from 

 North Carolina : by Isaac Lea. 



85 

 85 

 85 

 85 

 85 

 86 



Unio "Wheatleyi Lea. 

 percoarctatus Lea. 

 gracilentus Lea. 

 micans Lea. 

 Genthii Lea. 

 Emmonsii Lea. 



86 

 86 

 86 

 86 

 86 

 86 



Unio spadiceus Lea. 



insulsus Lea. 



striatulus Lea. 



macer Lea. 



contractus Lea. 

 Anodonta virgulata Lea. 





I. Lea. — Note on — 



101 



Unio spinoaus. 





Lea. — Descriptions of six new species of Fresh-water and 

 Laud Shells of Texas and Tamaulipas, from the collection of 

 the Smithsonian Institution : by Isaac Lea. 



101 

 102 



102 

 102 



Unio Berlandierii Lea. 



Popeii Led. 

 Bairdianus Lea. 

 Ano donta Heuryiana Lea. 



102 

 102 



Helix (Polygyra) Couch- 

 iana /^a.. 

 Tamaulipasensis Lea. 



May. 



I. Lea. 



104 

 104 



Unio umhrosus = U. umbrans fjea. 



Wheatleyi = U. Catawbensis Lea. 



June. 



Conrad.— Descriptions of two new genera of Shells : by T. A. 



CO.NKAD. 



105 

 lij5 



Gonidea Cniir. (n. g.) 

 1 Randalii Trunk. 



Anodon A'a/ic/a/u'Trask. 



165 

 166 



2 Gonidea feminalis GId. 



AiKidon feiiiinalis Uld. 



3 ? Anodon angulata Lea. 



