166 HELIX-HELICELLA. 



gularly roughly striated, sculptured with malleated impressions and 

 short horizontal oblique lines. There are fully 7 whorls, slowly and 

 rather regularly increasing, the upper forming a small and somewhat 

 projecting, translucent and horn-colored or blue-black apex ; the 

 following are quite convex, separated by the linear suture which 

 becomes deeply impressed below ; last whorl cylindrical and a trifle 

 flattened below, generally not at all descending in front, but spec- 

 imens also occur in which the last half of the whorl descends. Aper- 

 ture rather large, circular or ovate-circular, strongly lunate, slightly 

 tinted with yellowish inside ; the peristome is thin, acute, simple, at 

 a little distance within it is strongly white lipped ; the margins con- 

 verge somewhat and are connected by a thin scarcely noticeable 

 callus ; columellar margin somewhat dilated at the insertion and 

 reflected over the umbilicus. (Kob.) 



Alt. 21, greater diam. 27, lesser 22 mill. 



Alt. 20, greater diam. 25, lesser 22 J mill. 



Alt. 18, greater diam. 26, lesser 22 mill. 



Near Berrouayhia, Algieria. 



If. moneriana Bourg., KOBELT, Rossm. Icon. n. f. iv, p. 88, 

 f. 682-684. 



Has a stronger white lip than cespitum, and the umbilicus is nar- 

 rower. 



H. LAURIN^E Issel. PL 44, figs. 99, 100, 1. 



Shell profoundly perforated, globose-depressed, transversely 

 dilated, fragile, shining, striatulate and irregularly slightly malle- 

 ated, brown, ornamented with white or brown-dotted radiating 

 bands. Apex smooth, very obtuse, brownish. Whorls 6 J, separated 

 by an impressed suture, the upper ones nearly plane, the last rotund, 

 inflated, dilated at the aperture and slightly descending. Aperture 

 oblique, subrotund ; peristome acute, margins separated. 



Alt. 10, diam. 16 mill. (Issel.') 



Tunis (Marchese Laura Doria.) 



Helix (Xerophila f) laurince ISSEL, Annali Mus. Civ. di Storia 

 Nat. di Genova (2) ii, 1885, p. 6, figs. 



Somewhat allied to H. cdntce Bgt. and tiranoi Bgt. of Spain. 



H. AFFINIOR Debeaux. PL 39, figs. 34, 35. 



Shell moderately but deeply umbilicate, depressed globose, the 

 spire conoid, apex minute, subobtuse ; opaque ; solid ; all over rudely 



