91 MICHIGAN SURVEY, 1905. 



among the damp leaves in the woods toward the bottom of the slope, II. 2, 

 and near the top under fallen pine logs among the heath plants, III. 1 . It was 

 also found in the tamarack swamp, IV. 4, in decaying arbor vitae and tam- 

 arack logs. 



11. Pyramidula asteriscus (Mse.). IV. 4. Two were found beneath 

 the bark of fallen tamarack trees in the peat bog. This is the only station 

 at which this species was taken. 



12. Helicodiscus lineatus (Say). Among the damp fallen leaves in the 

 hardwoods, II. 2; near the bottom of the slope, III. 1; in fallen tamarack 

 logs in the tamarack swamp, IV. 4; in the damp humus about the roots of 

 ferns on the banks of Carp creek, VI. This species seems to prefer a damp 

 habitat, and the dead shells found in the crevices of the cliff face and among 

 the talus blocks were probably blown there. 



13. Acanthinula Jiarpa (Say). III. 2. A number of specimens were 

 collected in the dry soil held by the grasses and heath plants on the mountain 

 top. This is one of the characteristic molluscs of this exceedingly dry and 

 exposed habitat. 



14. Punctum pygmaeum (Drap.). II. 1. A few specimens were collected 

 in the damp humus among the roots of an arbor vitae in the swamp. II. 

 2. Found to occur quite abundantly among damp leaves in the hardwood 

 forest.' III. 1. A few individuals were found under fallen logs among the 

 huckleberry bushes in the aspen zone. III. 2. Several taken in the dry 

 earth about the roots of New Jersey tea on the mountain top. IV. 4. A 

 few found beneath the bark of fallen tamarack trees in the peat bog. 



15. Sphyradium edentulum (Drap.). II. 2. Among the damp leaves 

 in the hardwood forest; also found under fallen pine trees in the aspen zone, 



III. 1, and in decaving tamarack and arbor vitae logs in the tamarack swamp, 



IV. 4. 



16. Polygyra albolabris (Say). III. 1. Several specimens were taken 

 beneath fallen logs in the aspen zone on the mountain top, and among the 

 damp leaves in the hardwood forest, VI. 



17. Polygyra sp. [young, probably albolabris (Say)]. III. 2. In the dry 

 earth about the roots of the bearberry on the mountain top. 



18. Polygyra fraterna (Say). II. 3. On a log in the clearing after a 

 heavy dew. VI. Among the damp leaves in the forest. 



19. Strobilops virgo (Pils.). Found in the damp leaves of the hardwood 

 forest near the bottom of the slope, II. 2; under logs in the aspen zone near 

 the top, III. 1 ; in the dry earth among the roots of the heath plants on the 

 mountain top, III. 2, and among the roots of the blueberry in the aspen zone, 



III. 4. It was also found in decaying tamarack logs in the tamarack swamp, 



IV. 4; a few in the humus beneath a hemlock on II. 2, and in the moist 

 loam about the roots of ferns on the banks of Carp creek, VI. 



20. Bifidaria curvidens (Gld.) . This species was taken under logs in the 

 aspen zone on the mountain top, III. 1, and on the bald areas, III. 2, in the 

 dry earth held by the heath plants. 



20a. Vertigo gouldii Binn. Taken in the Porcupine Mountains, and at 

 Limestone Mountain in the summer of 1903. These specimens have only 

 recently been identified and with the following species constitute the forms 

 listed in the 1903 list as Vertigo sp. (Sixth Report Mich. Acad. Sci. 1904, 

 p. 190). 



20b. Vertigo ventricosa elatior Sterki. See 20a. 



21. Cochlicopa lubrica morseana (Doh.). This species was only found 

 in damp leaves in the hardwood forest, II. 2, and in the moist humus on the 

 banks of Carp creek, VI. 



