22 HELIX. 



compressly inflated, with a thread-like carina round the perspective 

 umbilicus ; peristome simple, acute. Diam. 15 mill. 



Algeria. 

 H. TURCICA, Chemn. PL 4, figs. 58-60. 



Widely umbilicated, rugosely, vermicularly striated, crenulately 

 carinated, greyish white; whorls 5, rapidly increasing, with sub- 

 crenulated suture, umbilicus perspective, bounded by a crenulated 

 carina. Diam. 24 mill. 



Morocco. 



It is H. eratera, Schum. 



H. MOGADOBENSIS, Bourg. PI. 4, figs. 61-63. 



Widely umbilicated, solid, cretaceous, opaque, yellowish white, 

 vermicularly striate; whorls five, all slightly carinate, peripheral 

 carina compressed, crenulated, last whorl a little descending in 

 front, umbilicus bordered by a thread-like carina. 



Diam. 17 mill. 



Mogador, Morocco. 



H. MOGRABOA, Morelet.- PI. 4, fig. 64. 



Moderately umbilicated, vermicularly striate, cretaceous, solid, 

 grayish white ; whorls 6, slowly increasing, crenulately carinated at 

 the suture, peripheral carina compressed, tubercularly crenulated, 

 base turgid, the umbilical region defined by an angle. 



Diam. 17 mill. 



Morocco, Algeria. 



H. DEGENERANS, MOUSSOD. PI. 4, figS. 65, 66. 



Widely umbilicated, cretaceous, vermicularly striated; whorls 

 5s , slightly convex above, crenulately carinated, umbilicus with 

 a thread-like carina ; peristome acute. 



Diam. 16 mill. 



Morocco. 



H. CONOPSIS, Morelet. PI. 4, figs. 67, 68; PI. 5, figs. 11-13. 



Moderately umbilicated, granularly rugose, particularly below, 

 grayish white, cretaceous; whorls 6, scarcely convex, periphery 

 with a thread-like carina, base convex, umbilical region angulated. 



Diam 12 mill. 



Morocco, 



Unfigured Species of Xeroleuca. 



H. DAROLI, Letourn. Algeria. 



H. DJARICA, Bourg. Algeria. 



