492 



MICHIGAN SURVEY, 1905. 



Var. ALBA (Tryoti). 



Anguispira alternata alba, Tryon, Am. Jour. Con., II., 261, (1866). 



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



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



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



Unicolored pale greenish- white. 



The typical form is common everywhere. The variety is found occasion- 

 ally associated with it in the western part of the state, from Kent county to 

 the St. Mary's river. It has not as yet been reported from the eastern part 

 of the state. 



PYRAMIDULA SOLITARIA (Say). 



Shell broadly umbilicated, globosely depressed^ 

 coarse, solid, obliquely and finely striate; white to 

 dark reddish horn-color, with from two to three red- 

 dish brown revolving bands; whorls 6, convex, suture 

 deep; aperture rounded lunate, pearly white and 

 banded within; peristome simple, acute. 



Alt. 15, greater diam. 25, lesser 22 mm. 



Fig. 80. P. soHtnria. (Binney.) 



Helix solitaria, Say, Jour. A. N. S. P., II., 157,(1821). 



Patula , W. G. Binney, Man. Am. Land Shells, 254, fig. 267, 



(1885). 



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



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



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



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



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



Var. ALBINA (W. G. Binney). 



Lighter colored without bands. 

 Patula solitaria albino , W. G. Binney, Man. Am. Land Shells, 254, fig. 268, 



(1885). 

 Rare in the southeastern part of the state, but appar- 

 ently more abundant in Kent county, the only reported 

 locality in the western part of the state. Specimens said 

 to have been collected in Chippewa county have also been 

 received. The variety has been reported from Kent 

 county only. 



Fig. 81. var. albina. 

 (Binney.) 



Subgenus QONVODISCUS Fitzinger. 



Shell rather small, depressed, with low but convex spire and open umbili- 

 cus. Apical H whorls smooth, the rest obliquely ribbed-striate, rather tubu- 

 lar, rounded or keeled at the periphery, unicolored. Aperture wide, lunate; 

 lip simple. 



