MOLLUSCA. 153 



LIST OF SPECIES. 



PULMONATA. 



Helicidae. 



1. Polygyra albolabris (Say). — This species appeared to be one of 

 the most abundant and widely distrilmted of the larger shells in this 

 region. It was found in the following localities and habitats: on Sand 

 Point, under fallen logs among sand dunes, even on the outermost 

 ones (26)*, among driftwood and decaying sedges along the sand 

 beach (25) and among fallen leaves, etc., around the borders of swamps 

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

 among decaying leaves, etc., in both swampy and dry woods (30, 

 31), under boards in a dry clearing (32), under slabs of rock on the 

 open rock beaches (33), among driftwood and sedges along the sand 

 beaches (34) ; at Caseville, on wooded fiats (37) ; at Rush Lake 

 under fallen logs in dry woods (39), in similar places in meadows 

 along the edges of woods (40) and among the sand dunes along the 

 borders of swamps (26) ; and under fallen logs, etc., on the wooded 

 flats (36) along the Pinnebog River. Altho sometimes found in 

 damp places, this shell appeared to prefer the drier habitats. 



The shells varied considerably in size; the largest shells were found 

 on North and Stony Islands, where the thin, rich soil, over limestone 

 rock, seemed to furnish excellent conditions for all of the larger land 

 shells. The smallest were obtained from the sand dunes, where the 

 shells graduated into the variety maratima. A single albino speci- 

 men was obtained. under a log in high woods, 31, on Stony Island. 



2. Polygyra albolabris, var. dentata (Tryon). — A single specimen 

 of the dentate form was collected near a swamp (26) on Sand Point. 



3. Polygyra albolabris, var. maratima (Pilsbry). — This shell was 

 the most aljundant one among the sand dunes. It was obtained 

 from Sand Point, among sedges and driftwood along the sand beach 

 (25) and under fallen logs on the sand dunes (28) ; from near Rush 

 Lake, on both the inner and outer sand dunes (29. 28) and in high 

 woods grading into the sand dunes (39), under fallen logs; and from 

 wooded flats (37) near the sand dunes along the Pinnebog River. 



4. Polygyra multilineata (Say). — A few specimens of this shell 

 were obtained from under logs in damp places along the borders of 



*The numbers thruout the list refer to the type of habitat described above under the same 

 number. 



