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. PL 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, Mtihlf. 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 5-6, a little convex, the last not descending ; 

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



Diam. 12 mill. 



Northern Italy, Southern Austria ~ 



