252 HELIX. 



conic, apex obtuse, nucleus very large ; whorls 4J, regularly increas- 

 ing, sutures regularly impressed, somewhat crenulated ; last whorl 

 inflated, anteriorly descending; aperture lunate-oval ; peristome 

 labiate with white within, columellar and basal margins thickened, 

 columellar margin callous, subdentate ; parietal wall with a light 

 callus. Diam. 32-34, alt, 26-28 mill. (Kobelt\ 



Adsclwria. 



Allied to vulgaris by the large obtuse apex, to nordmanni by the 

 form, coloration, etc. 



H. PRASINATA Roth, 1855. PL 56, figs. 14, 15. 



Irnperforate, turbinate-globose, striate, thin, greenish, with a de- 

 ciduous epidermis, very obsoletely and narrowly fasciate ; spire short, 

 acute ; whorls 4-1, the upper subplane, last ample globular ; aper- 

 ture slightly oblique, lunate-oval, livid within, sometimes pearly; 

 peristome simple, the margins joined by a callus, right margin 

 straight, acute, the columella scarcely arcuate, thickened, adnate. 

 (Roth). Diam. 30, alt. 31 mill. 



Jerusalem. 



Differs from the following species in the stronger striation, the 

 last whorl flattened above, giving the shell a conic form ; the aper- 

 ture is smaller, the columellar callus much more developed ; the 

 coloration is greenish, with slight traces of' bands, especially upon 

 the upper whorls ; the aperture is brownish-yellow within, without 

 trace of bands. 



H. CAVATA Mousson/ PI. 69, figs. 32,33. 



Imperforate, globose-conic, solid, whitish, with light chestnut 

 bands which are more or less suffused over the whole surface, marked 

 in an oblique direction (at right angles to the rather coarse irregular 

 stria3 of increment,) with short, narrow clear-grayish murks, densely 

 but obsoletely spirally striate (under a lens) ; spire conoid, apex 

 obtuse smooth ; suture moderately impressed ; whorls 4, moderately 

 convex, the last rapidly widening, slightly descending anteriorly ; 

 aperture oval-lunate, slightly oblique, brownish white within ; peri- 

 stome simple, ends scarcely converging, columellar margin slightlv 

 straightened, expanded, reflexed and closely adnate only in the 

 immediate vicinity of the umbilicus, white ; parietal callus very 

 slight, white. Diam. 30, alt. 30 mill. 



The above description is drawn from a specimen corresponding 

 with the type figured by Kobelt. The oblique clear-grayish marks 



