90 



THE NAUTILUS. 



Lake the water flows into Otsego Lake and a number of species 

 occur which are not found in Canadarago. From the latter the 

 streams empty into the Susquehanna River and species finally inter- 

 mingle. 



Amnicola Umosa Say. In every lake and a large number of 

 streams. 



Pomatiopsis lapidaria Say. Canadarago Lake. 



Valvata tricarinata Say. Weaver, Canadarago and Allan Lakes. 



Somatogyrus integer Say. Sunset Creek. 



Campeloma decisum Say. Canadarago Lake. 



Omphalina fuliginosa Griff. Sunset Hill, near Canadarago Lake. 



Omphalina inornata Say. Sunset Hill. 



Zoniloides nitidus Miiller. Woods near Richfield Spa. 



Zonitoides arboreus Say. Sunset Hill. 



Gnstrodonta ligera Say. Sunset Hill. 



Pyramidula alternata Say. Everywhere with other species (one 

 albino farm). 



Pyramidula strialella Anthony. East of Sunset Hill. 



Potygyra tridentata Say. Sunset Hill, west of Canadarago Lake. 



Po/ygyra Sayi Binney. Sunset Hill, east of Canadarago Lake, 

 near Oak Creek. 



P°ly9y ra albolabris Say. Cooperstown, near Canadarago Lake, 

 Sunset Hill. 



P°hgy ra pallida Say. Washed down Town Creek. 



Polygyra thyroides Say. East of Canadarago Lake. 



Polygyra monodon Rack., var. fraterna Say. Woods near Rich- 

 field Spa. 



Vallonia palchella Miiller. In fields, everywhere. 



Circinaria concava Say. Sunset Hill, near Allan Lake. 



Vertigo ovata Say. Under bark, near Richfield Spa. 



Vertigo milium Gould. Near Sunset Creek. 



Cochlicopa lubrica Miiller. Cooperstown (Council Rock), Rich- 

 field Spa. (town), near Young's Lake. 



Carycldum exiguwn Say. Near Sunset Creek. 



Succinea ovalis Gld. Near Canadarago Lake, near Oak Creek, 

 Cooperstown. 



Succinea obliqua Say. Sunset Hill, in fields. 



Succinea totteniana Lea. Near Allan Lake. 



Succinea relusa Lea, var. peariensis Walker. Near Oak Creek. 



