HELIX. 171 



Var. DIODON, Parr. Figs. 27-29. 

 Shell larger, somewhat more globose. 



Eastern Europe. 

 H. dibothrion, Friv. is a synonym. 



H. BICALLOSA, Frivaldsky. PL 38, fig. 24. 



Umbilicus nearly covered, shell thin, striulate, shining, reddish 

 corneous ; whorls 8, a little convex, slowly increasing, the last sub- 

 angulate and white banded on the periphery, scarcely descending 

 in front ; peristome acute, simple above, basally shortly reflected, 

 with a broad basal interior callus produced into two teeth, and ex- 

 terior scrobiculation. Diam. 10 mill. 



Siberia. 

 Subsection TROCHISCUS, Held. 1837. 



H. COBRESIANA, Alten. PI. 38, figs. 25, 26, 44. 



Perforate, corneous, pubescent ; whorls 6, the last with whitish 

 peripheral band ; lip thickened, labiate within, with a basal tooth. 



Diam. 10 mill. 



Middle Europe. 



H. unidentata, Drap., H. monodon, Fer. H. ventricosa, Jan, H. 

 unidens, Ziegl., H. Villce, Miihlf. are synonyms. 



Var. ALPESTRIS, Clessin. 



Small, spire depressed, last whorl moderately carinated, more 

 convex below. 



Tyrol. 



Var. ANODONTA, Tschapak. Fig. 44. 



Tooth not developed. 



Styria. 



H. EDENTULA, Drap. PL 38, figs. 31-33. 



Subperforate, somewhat solid, granularly striate, subpilose, cor- 

 neous ; whorls 6, convex, slowly increasing, the last scarcely descend- 

 ing in front, whitish banded, base flattened ; peristome labiate within, 

 callously dilated on the base. Diam. 8 mill. 



Middle Europe. 



The synonyms are H. depilata, Drap., H. liminifera, Held. 



H. LEUCOZONA, Ziegler. PL 38, figs. 34, 35. 



Perforate, light reddish brown, with a pellucid peripheral band, 

 lightly striated ; whorls 56, a little convex, the last not descending ; 

 peristome scarcely patulous, white-lipped, basal margin strict. 



Diam. 12 mill. 



Northern Italy, Southern Austria. 



