50.8 



MICHIGAN SURVEY, 1905. 



Fig. 124. Dentition of A. harpa. (Binney.) 



ACANTHINULA HARPA (Say). 



Shell subperforate, ovately conic, pellucid, very thin, irregu- 

 lar striate, hght horn color; spire conical, rather obtuse; whorls 

 four, convex, the upper ones smooth, the last two with promi- 

 nent distant, thin, colorless ribs, the last whorl rounded, some- 

 what longer than the spire; aperture Innately oval; peristome 

 simple, acute. 



Alt. 3^, greater diam. 2 mm. 



Helix harpa, Say, Long's Exped., II., 256, pi. XV., fig. 1. (1824). 

 Acanthinula harpa, W. G. Binney, Man. Am. Land Shells, 185, fig. 183, (1885). 

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



A northern species. The Porcupine mountains, Ontonagon county, and 

 Isle Royale, in the Upper Peninsula, and Charlevoix, Petoskey and Beulah, 

 Benzie county, in the Grand Traverse region are the localities thus far re- 

 ported. Easily distinguished by its elevated shape and prominent ribs. 



Genus PUPOIDES Pfeiffer. 



Shell rimate, cylindrically ovate, apex rather obtuse, rather smooth, shin- 

 ing, pellucid; whorls 6-7, rather convex, aperture semi-ovate, edentate; 

 peristome thickened, reflected, its external margin decidedly arcuate. 



Animal as in Pupilla. 



^\^0^ 



Fig. 126. Jaw of P. marginatus. Fig. 127. Dentition of P. marginatus. (Binney.) 



Fig. 128. 

 P. marginatus. 

 (Binney ) X4, 



PUPOIDES MARGINATUS (Say). 



Shell fusiform, regularly diminishing in size from the body- 

 whorl to the apex, smooth; brownish horn-color; whorls 6 very 

 convex, very lightly striate; suture well impressed; aperture lat- 

 eral, rounded oval; peristome white, rather broadly reflected, 

 strongly curved above ; umbilicus perforated. 



Alt. 5^, diam. 2-2^ mm. 



Cyclostoma marginata. Say, Jour. A. N. S. P., II., 172, (1821). 



Pupa ,fallax W. G. Binney, Man. Am. Land Shells, 324, fig. 351, 



(1885). 



