464 



MICHIGAN SURVEY, 1905. 



Helix profunda, Sager, Doc. H. Rep. Mich., 1839, 420; separate, 14. 



, Miles, Rep. Geol. Surv. Mich., 236, (1861). 



Ulostoma , Currier, Shell-bearing Moll. Mich., 5, (1868). 



, DeCamp, Shell-bearing Moll. Mich., 6, (1881). 



Polygyra , Walker, Rev. Moll. Fauna Mich., 16, (1894). 



Var. ALBA (Walker). 



White or pale yellowish horn-color, without bands. 



Polygyra profunda alba, Walker, Terr. Moll. Mich., 12, (1899). 



Southern part of the state. Not yet reported north of Muskegon county 

 on the west and Macomb county on the east in the lower peninsula.* The 

 variety occurs occasionally, associated with the typical form, in Washtenaw 

 and Monroe counties. The other extreme in coloration, in which the bands 

 coalesce and cover the entire surface (var. unicolor) has not 3^et been noticed 

 in this state. 



Fig. 10. P. sayana. 

 (Binney.) 



f POLYGYRA SAYANA Pilsbry. 



Shell umbilicated, orbicularly depressed, thin; light rus- 

 set, shining; whorls 5-6, finely and obliquely striate; suture 

 impressed; aperture sub-circular; peristome white, narrow, 

 reflected, with a slightly projecting tooth on the inner 

 edge of the basal portion near the umbilicus; parietal wall 

 with a sub-prominent, white tooth; umbilicus moderate, 

 deep base; rounded. 

 Alt. 14, greater diam. 23, lesser 19 mm. 



Polygyra sayana Pilsbry, Proc. A. N. S. P. 1906, 127. 



Mesodon sayii, W. G. Binney, Man. Am. Land Shells, 319, fio-. 343, (1885). 



Helix , Miles, Rep. Geol. Surv. Mich., 236, (1861). 



Ulostoma , Currier, Shell-bearing Moll. Mich., 5, (1868). 



, DeCamp, Shell-bearing Moll. Mich., 6, (1881). 



Polygyra , Walker, Rev. Moll. Fauna Mich., 17, (1894). 



Rare and restricted to the northern part of the state. Reported from 



Charlevoix, Emmet, Presque Isle, Huron and Tuscola counties. Not re- 

 ported from the upper peninsula. 



4 POLYGYRA ALBOLABRIS (Say). 



Shell imperforate, convex; unicolored, yellowish- 

 brown, russet, or light chestnut color; whorls 5-6, 

 finely and obliquely striate and decussated with very 

 minute, but distinct, wav}'-, impressed, revolving lines, 

 which are most apparent on the back of the reflected 

 peristome, suture well impressed; peristome white, flat- 

 Fig, ii, p. aZ6oZa&m. (Binney.) tened, abruptly and very widely reflected. Alt. ISJ- 



24J, diam. 24f-34| mm. 

 Helix albolahris, Say, Nich. Encycl., pi. I., fig. 1, (1817). 



Mesodon , W. G. Binney, Man. Am. Land Shells, 298, fig. 319, 



(1885). 



Helix , Sager, Doc. H., Rep, Mich., 1839, 420; separate, 14. 



, Miles, Rep. Geol. Surv. Mich., 235, (1681). 



* In the upper pennisula it has been found in Iron and Dickinson counties. 



