154 MOLLUSCA. 



swamps (26) at Sand Point. It was also collected, in considerable 

 numbers, in swampy woods (30) on North and Stony Islands. In the 

 latter locality, a single specimen was found on higher ground (31). but, 

 in the region studied, the species appeared to prefer a wet habitat. 



5. Polygyra thyroides (Say). — Single specimens of this species 

 were found at Sand Point, along the border of a swamp (26) and at 

 Hat Point, among leaves under a rock ledge (27). It was collected 

 in larger numbers on North and Stony Islands, from under logs both 

 in the swampy and the higher woods (30, 31) and on the sand beach 

 (34) ; at Caseville. in dry meadows and under driftwood, etc., on 

 wooded flats (36, 37): and near Rush Lake, from under fallen logs in 

 dry woods and along the edges of meadows (39, 40). 



6. Polygyra fraterna (Say). — This species was generally found on 

 rich and ciuite dry ground. It was obtained in considerable numbers 

 on wooded flats (37) along the Pigeon and Pinnebog Rivers, and in 

 swampy and dry woods (38, 39) and on the outer and inner sand dunes 

 (28, 29) near Rush Lake. 



7. Polygyra monodon '(Rackett). — This shell was found cjuite 

 abundantly as follows: at Sand Point, among driftwood along the 

 sand beach (25), and among fallen leaves near the borders of 

 swamps and lakes (26) ; on Stony and North Islands, under fallen 

 logs in swampy and high woods (30, 31), in a stone-pile in a dry 

 clearing (32) and under driftwood along the sand beach (34) ; and 

 near Rush Lake, under logs in swampy woods (38) and in a clearing 

 near a cedar woods (40). 



Polygyra sp? A considerable number of juvenile shells, too young 

 to identify, w^ere obtained from a stump on a wooded flat near Case- 

 ville (37) and from a log in a meadow near Rush Lake (40). 



Zonitidae. 



8. Vitrea hammonis (Strom). — This shell was found in abundance: 

 under driftwood and sedges along the sand beach (25) and under logs 

 and leaves around swamps and lakes (26) on Sand Point; under logs 

 and driftwood on the wooded flats (37) and the low and high meadow- 

 flats (35, 36) along the Pigeon River; under logs and among leaves in 

 the swampy and dry woods (38, 39), in the damp meadows (40) 

 and in Spoghnum in a tamarack swamp (42) near Rush Lake. 



9. Vitrea binneyana (Morse). ^ — This species was collected in small 

 numbers among sedges and driftwood along the sand beach (25) at 

 Sand Point, under logs and driftwood on the wooded flats (37) along 

 the Pigeon River, under logs and among leaves in wet woods (38) 

 near Rush Lake, and among leaves under a rock ledge (27) at Hat 

 Point. 



