THE NAUTILUS. 113 



serve records of the relative abundance of all forms of life where pri- 

 meval conditions still remain : 



Polygyra tridentata Say. Common. 



Polygyra fraudulenta Pilsbry. Frequent. 



Polygyra profunda Say. Common. 



Polygyra sayana Pilsbry. Three examples. 



Polygyra albolabris Say. Common, but no specimen of variety 

 dentata. 



Polygyra zaleta Binney. Common. 



Polygyra dentifera Say. Common. 



Polygyra palliata Say. Frequent. 



Polygyra monodon fraterna Say. Frequent. 



The Polygyras were most abundant in damp, dark woodland. 

 Curiously enough, I found not a single specimen of P. thyroides or 

 P. hirsuta. The former has been taken by Mr. S. Brown at Laurel 

 Ridge, Somerset county, Pa., and the latter at Ohio Pyle, Fayette 

 county, Pa. Possibly they do not push so far back into the moun- 

 tains as the other species. 



Bifidaria corticaria Say. Eight specimens. 1 



Bifidaria contracta Say. Two specimens. 



Vertigo gouldii Binney. Eighteen specimens. 



Circinaria cancava Say. Common. 



Omphalina cuprea Raf. Common. 



Mesomphyx inomata Say. Common ; most frequent on dead 

 leaves on the floor of the forest. 



Mesomphyx laevigata monticola Pilsbry. Three examples. 



Vitrea indentata Say. Twelve specimens. 



Vitrea carolinensis Cockll. One specimen. 



Vitrea mnltidentata Binn. Two specimens. 

 Vitrea ferrea Mse. Four specimens. 



Vitrea milium Mse. Two specimens. 



Zonitoides arborca Say. Common. 



Gaslrodonta intertexta Binney. Several. 



Gastrodonta ligero Say. Frequent. This and the preceding 

 seemed to be most abundant in open sugar-maple groves. 



'Mr. Vanatta kindly sifted a quantity of dirt and leaves, collected for 

 Pupidae, etc., and the actual number of specimens of these minute species ob- 

 tained from it are given as a possible indication of their abundance. 



