NORTII AMERICAN CONCHOLOGY. 



385 



[Proceedings of the Acad, of Nat. Sci. of Philad. — continued.'] 



Vol. 



Vlll 



viii 

 viii 

 viii 



vm 

 viii 



Page. 



Vlll 



viii 



May, 



viii 



Aug. 



80 

 80 

 80 



80 



80 

 81 

 81 



81 

 81 



92 



S5 



1856. 



103 

 1856. 



145 



Sept. 1S56. 



viii 213 



1856. 



Name. 



Locality. 



Physa triticea Lia. 

 Flanorbis Traskii Lea. 

 Lymnaea proxima Lea. 

 Ancylus patelloides Lea. 



Notes on — 

 Margaritana margaritifera Lea. 

 Alasmodonta falcata Gould. 



Yubunsis Trask. 

 Anodonta Wahlamatensis Lea. 

 A. trianyulata Trask. 

 rdtundovata Trask. 

 angulata Lea. 



A.fnninalis Gould. 

 Randall i Trask. 

 Helix Oregonensis Lea. 

 Nickliniana Lea. 



Californiensis Lea. 

 Lymnaea exigua Lea. 



pallida Adams. x 



Physa heterostropha Say. 

 Melania occata Hinds. 



(Paludina) seminalis Hinds. 

 Planorbis trivolvis Say. 



amnion Gould. 



Shasta County, Cal. 

 Kern Ike., Tulan Co ,Ca. 

 Arroya S. Antonio, Ca. 

 Sacramento river, Cal 



Klamath and Yuba. 



Sacramento river. 



Upper San Joaquin. 



[Co., Cai. 

 P't Cypress, Monterey 

 Tomales Bay & Dead 



Man's Island. 

 Point Cypress. 

 San Antonio Arroya. 

 San Antonio Arroya. 

 Los Angeles. 

 Sacramento river. 

 Sacramento river. 

 Horn lake. [Valley. 

 Lagoons, Sacramento 



Lea. — Descriptions of twenty-four new species of Exotic 

 Uniones : by Isaac Lea. 



Unio umbrosus Lea. 



(Medellin river, Mex. 



Lea.— Descriptions of four new species of Exotic Uniones: 

 by Isaac Lea. 



Unio Coloradoensis Lea. 



1 Rio Colorado, Texas 



Lea.— Descriptions of fifteen new species of Exotic Mela- 



niana : by Isaac Lea. 

 Melania rubida Lea. |Mexico. 



L,ea. — Description of the byssus in the genus Unio: by 

 Isaac Lea. 



Lewis.— List of Mollusca in Little Lakes, Otsego County, 

 New York : in a letter from Dr. James Lewis. 



Vol.1 Pa. | Name, 



viii 259 Unio radiatus Lam. 



viii 259 Anodonta ? 



viii 259 Cyclas similis Say. 

 viii 259 rhomboidea Say. 

 viii 2591 crocea Say. 

 viii 259 Pisidium variabile Prime. 

 viii 259 compressum i J rii«e. 

 25 



Vol.l Pa.) Name. 



viii 259 Pisidium ventricosum 



(iobtusaU Pfr.) [J 'rime, 

 viii 259 Lymnaea gracilis Jay. 



columella Say. 



appressa Say. 



viii 259 

 viii 259 

 viii 200 

 viii 260 



disidiosa Say. 



