HELIX-HELICELLA. 173 



rhorls. In striation it is nearer to H. candicans than to H. 

 instabilis. ' 



Var. BAKOWSKIANA Clessin. (Vol. Ill, p. 248.) 



Smaller, spire more elevated, upper surface strongly striated, 

 umbilicus narrower. 



The varietal name precedes that of the species and should replace 

 it. 



H. HILLYERIANA Paulucci. PI. 45, figs. 28, 29, 30. 



Shell depressed globose, umbilicate, thin ; whitish-buff ornamented 

 with narrow interrupted pale chestnut zones; irregularly ribbed- 

 striate ; spire convex, apex smooth, slightly projecting, horny red- 

 dish ; whorls 6*, regularly increasing, the last little larger, not 

 descending ; the suture impressed ; last whorl obscurely carinated 

 at the periphery, the carina disappearing toward the aperture. 

 Aperture oblique, lunate, rounded, white-lipped within ; peristome 

 thin, acute, straight, columellar margin slightly reflected. (Pcm/f.) 



Alt. 9, greater diam. 12*, lesser 11 mill. 



Decimomanun, Sardinia. 



H. hillyeriana PAUL., Bull. Soc. Mai. Ital. 1882, p. 251, t. 7, f. 4. 

 H. TUTA Paulucci. PI. 45, figs. 22, 23, 24. 



Shell globose, nearly covered perforate, thin ; whitish, having 

 many chestnut bands, or buff, banded and dotted ; substriate. Spire 

 convex, apex minute, corneous or blackish, smooth ; whorls 5-6, 

 slightly convex, the first slowly, the rest rapidly increasing, separated 

 by an impressed suture ; last whorl larger, swollen, rotund, straight 

 at the aperture. Aperture oblique, exactly rounded, slightly lipped 

 within ; margins joined by a very thin callus, columellar margin 

 slightly reflected, half covering the perforation. (Paul.') 



Alt. 91-11, greater diam. 13-14, lesser 1H-12* mill. 



Sardinia. 



Helix tuta PAUL., Bull. Soc. Mai. Ital. 1882, p. 245, t. 7, f. 1. 



H. DOHRNI Paulucci. PI. 45, figs. 15, 16, 17. 



Shell globose, conoid, nearly covered umbilicate ; thin ; dull gray, 

 ornamented with narrow interrupted chestnut zones ; distinctly but 

 unequally striated ; spire conoid, apex obtuse, smooth, pale corneous ; 

 whorls 6-6 i, the inner slowly and regularly increasing (the last and 

 next to the last much larger and more globose), separated by a dis- 

 tinct suture, last whorl ventricose, rounded, rapidly descending; 



