210 HELIX. 



H. ASCHER^E Kobelt, 1880. PL 62, figs. 57-60. 



Subdepressed-turbinate, rather thin, striatulate, im perforate, whit- 

 ish, rarely unicolored, or with four girdles of small rufous-brown 

 spots; whorls 5->, regularly increasing, the upper ones slightly con- 

 vex, penultimate and last whorl convex, with impressed suture ; 

 body-whorl subdilated, inflated below toward the aperture, anterior- 

 ly strongly and abruptly deflexed, and sub-constricted behind the 

 aperture ; aperture very oblique, lunate-rotund ; peristome reflexed, 

 strongly albolabiate ; fauces brownish, showing the bands ; margins 

 converging, the basal arcuate, sometimes callous, dilated and wholly 

 covering the .umbilicus, brown-spotted at the insertion. (Kobelt.} 



Diam. 22 J, alt. 16 mill. 



Trapani, Sicily. 



"The upper whorls are quite flat, like those of platychela; and it 

 would appear as though young examples were keeled ; the suture is 

 not at all impressed. The penultimate whorl first begins to be more 

 convex, and the suture deeper ; the last whorl is somewhat widened, 

 rounded at the periphery, the base tumid as it approaches the mouth, 

 very deeply deflexed, and somewhat constricted." (Kobelt.) 



Very closely allied to some forms of If. platychela. 



H. RID ENS Martens, 1884. Unfigured. 



Covered perforate, subglobose-depressed, white, marked with four 

 dark brown bands, the upper interrupted, striatulate below the sut- 

 ure, shining, whorls 4?. the first convex, grayish-brown, unicolored, 

 the following subangulate, body-whorl rounded, convex below, 

 deeply descending anteriorly ; aperture very oblique, wide-ovate j 

 peristome white, rather broadly reflexed, the margins approx- 

 imating, arcuate above and below, the columellar margin dilated and 

 appressed. Diam. 17, alt. 11 mill. ; aperture, diam. and alt. 9 mill. 



(Martens.) 



Dor gali, Sardinia. 



" Some specimens exhibit a small umbilical fissure, but in the 

 greater number this is closed by the expansion of the columellar 

 margin. A very minute spiral striation is visible upon the upper 

 surface of most specimens, with a lens of moderate power." 



" This species is comparable to the Sicilian H. globularis Ziegl., 

 and the more flattened forms of H. platychela Mke. By the broad- 

 er aperture, more strongly concave columellar lip, without trace of 

 a tooth, it may be distinguished from these." (Martens.) 



The following variations are described : 





