158 MOLLUSCA. 



large numbers in dry woods (39) and on the inner sand dunes (29) 

 near Rush Lake, and among leaves under a rock ledge at Hat Point 



(27). 



Succineidae. 



30. Succinea retusa Lea. — This shell was found in great abund- 

 ance in wet places thruout the region studied. It was collected as 

 follows: on Sand Point, among driftwood and rotting sedges along the 

 sand beach (25), on leaves and on trees growing in the water in 

 swamps (26), and on floating driftwood along the protected shores 

 of Saginaw Bay (7) and in Turtle Bay (8), and in a perennial 

 swamp (19); on Stony and North Islands, among sedges and drift- 

 wood along the sandy and rocky beaches (34, 33) and on driftwood 

 out in the water in these localities (7, 4) ; along the Pigeon River, in 

 swampy meadows (35) and on algae and driftwood in the upper and 

 lower portions, the ox bow pond and the "dead waters" (23, 21, 22, 

 24) of the river itself; at Rush Lake, in the sedge marsh along the 

 border of the lake (12) and in very wet places in woods nearby (38); 

 and near Little Oak Point, in a sand pool (6). 



31. Succinea ovalis Say. — ^This species was obtained at Sand 

 Point, among leaves, etc., in a large swamp (26), and near Rush Lake, 

 in swampy woods (38). Living specimens were found at Rush Lake 

 but not at Sand Point. An example measures: length 16.5mm., 

 diam. 10mm.. aperture length 12.5mm., apertm'e width 7mm. 



32. Succinea ovalis, var. optima Pilsbry. — A few shells of this 

 variety were collected along the wooded flats (37) of the Pigeon and 

 Pinnebog Rivers, and in a poplar swamp (38) about two miles east of 

 the first river. An example measures: length 21mm., width 12.5mm., 

 aperture length 14.5mm., aperture width 9.5mm. 



33. Succinea avara Say. — Specimens of this shell were found 

 in considerable numbers at Sand Point, among sedges along the sand 

 beach (25), under logs and fallen leaves along the shores of lakes and 

 swamps (26) and on floating driftwood out from the shore in the sedge 

 marshes (7); on North Island, among decaying sedges along the sand 

 beach (34) ; along the Pigeon River, under driftwood and logs in the 

 swampy and dry meadow and wooded flats (35, 36, 37) and on planks 

 floating along the marshy shore of the upper portion of the river (23) ; 

 near Rush Lake, under logs, etc., in swampy and dry Avoods and 

 meadows (38, 39, 40) ; and along the Pinnebog River, under logs and 

 driftwood on the wooded flats (37). 



34. Succinea avara, var. major W. G. Binney. — Single specimens 

 of this form were collected in swampy woods (30) on North Island 

 and in a sand pool (6) near Little Oak Point. The latter specimen 



