NATURAL SCIENCES OF PHILADELPHIA. 101 



Helix minutissima, Lea. 



A few specimens have been found in Litchfield by Dr. Brown 

 (1871). 

 Helix nitida, Mull. 



Usually found abundantly on wet ground, near streams, ponds, 

 and lakes. More common in the valley of the Mohawk. 



Helix palliata, Say. 



Not abundant. Occurs somewhat more plentifully in the Litch- 

 field ravines than elsewhere. 



Helix perspectiva, Say. 



Litchfield; very scarce. (1871.) 

 Helix pulchella, Meill. 



Common on damp soil in many localities. 

 Helix Sayii, Binney. 



Common in ravines, but not so abundant as to be found with- 

 out laborious search. 



Helix striatella, Anthony. 



Sometimes very numerous in the valley; usually not abundant 

 elsewhere. 



Helix tridentata, Say. 



A small variety. Common in ravines. 



Helix thyroides, Say. 



Seen only in the Mohawk Yalley. Col. Jewett, of Utica, finds 

 this species abundant and associated with albolabris by the side 

 of the railroad embankment, seven miles east of Utica. The few 

 specimens I have found occurred in an alder swamp west of the 

 Mohawk. 



Lymnaea catascopium, Say. 



Erie Canal and Mohawk River. I have seen a few shells, evi- 

 dently referable to this species, in a small lake in the south part 

 of Herkimer County. 

 Lymnaea columella, Say. 



Lakes. Not abundant. 



Lymnaea desidiosa, Say. 

 Common. 



Lymnaea elodes, Say. 



Stagnant water in various localities. 



1872.] 



