20 The Ottawa Naturalist. [May 



15th, 1917, and the data thus obtained have been included in the 

 paper. 



Helicidae. 



1. Polygyra tridentata (Say). De Grassi Point, common but by 

 no means abundant, occurring mainly in the hardwood bush, where 

 maple and beech predominate. It was rarely seen elsewhere. Mature 

 specimens were found from April 29th to September 20th. More 

 abundant and generally distributed at Toronto. A single specimen 

 was taken near St. William's, September 3rd, which was larger than 

 those from the more northern localities. 



2. Polygyra fraudulenta (Pilsbry). I found a large number of 

 shells of this species on a steep wooded hillside at St. William's, Sep- 

 tember 3rd, where they were associated with Gastrodonta intertexta, 

 Polygyra thyroides and Pyramidida alternata. They were distinctly 

 smaller than the single specimen of P. tridentata from the same general 

 locality, being of about the same size as the specimens of the latter 

 species from Toronto and Lake Simcoe. 



I have also seen a dead specimen of P. fraudulenta from the Don 

 Valley, Toronto, taken on July 2nd, 1916. 



3. Polygyra palliata (Say). De Grassi Point, rather scarce and 

 almost confined to the beech-maple woods, though immature specimens 

 were sometimes seen in the mixed woods. Adults were found only on 

 June 23rd, July 25th. and September 20th. It is commoner at 

 Toronto, Miss Ford having taken a number of specimens at several 

 different stations in the vicinity of the city, and I also found it common 

 in a rich hardwood bush near St. William's, September 3rd. It was 

 not observed on the Giant's Tomb Island, although the locality 

 appeared to be particularly favourable. It is probably near or beyond 

 the northern limit of its distribution here. 



4. Polygyra albolabris (Say). De Grassi Point, common and 

 generally distributed, occurring in greatest numbers in the hardwood 

 and poplar woods, but. frequent also in the mixed diciduous and 

 coniferous growth. Adults were apparently most numerous in June 

 and early July and again in September. Occasional specimens of 

 small size were found in somewhat dry or partly open grassy stations. 

 They resembled the var. maritima in size but showed no other 

 peculiarities. 



This species is equally common at Toronto and was taken also at 

 Go Home Bay, Giant's Tomb Island and near St. William's. 



5. Polygyra thyroides (Say). De Grassi Point, about as com- 

 mon as albolabris, frequenting similar stations but apparently more 

 partial to poplar woods, or mixed growths of poplar, birch, elm, cedar, 

 balsam fir, etc., than the typical hardwood bush. Adults appeared 

 throughout the season but seemed to be scarcer during August than at 



