MOLLUSCA. 161 



species, Carychium exile. It was also found. l)ut in lesser numbers, 

 on a wooded flat along the Pigeon River, under driftwood in wet 

 places (37), and under fallen logs, etc., in quite dry woods (39) and in 

 an open meadow near a cedar thicket (40) at Rush Lake. It was ob- 

 tained in greater abundance from similar places in a wet woods (38) 

 near Rush Lake. 



48. Carychium exile H. C. Lea. — ^This species occurred in about 

 the same localities as the preceding species. Specimens were found, 

 in larger numbers than those of Carychium exiguum, around the bor- 

 ders of swamps, etc. (26), but in lesser numbers on the sand beach 

 (25) at Sand Point. It was found in the wet meadows along the 

 Pigeon River (35) where Carychium exiguum. was not found, and on 

 the wooded flats farther up the riA'er (37), and in about the same 

 places (38, 39, 40) and in the same abundance as the preceding species 

 at Rush Lake. 



Lymnaeidae. 



49. Lymnaea stagnalis, var. appressa (Say).— This species was 

 quite abundant in the sedge marshes (7) along the shores of Sand 

 Point and near Caseville, on the mucky bottom in Rush Lake (11) 

 and near the mouth of a county drain (17) which emptied into the 

 lake. The shells vary considerably, as is characteristic of this species. 

 Those from Rush Lake are, as a general rule, smaller and more slender 

 than those from the Bay. An extreme from Rush Lake measures: 

 altitude 29.5mm., width 10.25mm., aperture length 15mm., aperture 

 width 7mm.; one from the Bay: altitude 53.5mm., width 23.5mm., 

 aperture length 28.5mm.. width 16mm. 



50. Lymnaea haldemani "Dkr.'' W. G. Binney. — A dead shell 

 of this species was collected in about six inches of water in a placa 

 where the marl layer over the sand was ciuite thick, off Dune Point 

 (15). This specimen could not have been long dead, as it was in 

 excellent condition. Several other dead specimens were found that 

 were so fragile that they could not be saved. The shell measures: 

 length 20.5mm., width 4.5mm.. aperture length 9mm., apertiu-e \\adth 

 3 mm. 



51. Lymnaea obrussa Say. — A very few specimens of this shell 

 were found at Sand Point, in a shallow, marly-bottomed marsh at the 

 east end of Wild Fowl Bay (7) and on the under side of lily-pads in 

 Turtle Bay (8), and at Rush Lake juvenile specimens were obtained 

 off Dune and Fourth Points (15. 16). A representative example 

 from Sand Point measures: altitude 8.5mm., width 4.5mm., aperture 

 length 5mm.. aperture width 3mm. 



Lymnaea obrussa Say, small form. — Shells thus labeled by Mr. 

 21 



