HELIX. 25 



H. SERRULATA, Beck. PI. 5, figs. 1, 2. 



Very narrowly perforate, corrugately tuberculate-striate, whitish 

 more or less banded with chestnut, especially on the base ; whorls 

 6, slightly convex, subcarinate, the last with angulated, tuberculated 

 peripheral angle ; peristome acute, internally labiate. 



Diam. 12 mill. 



Egypt. 

 H. crenulata, Olivier, is a synonym. 



H. PTYCHODIA, Bourg. PI. 5, figs. 7, 8. 



Narrowly umbilicated, rather thin, subtuberculate above and 

 crispately ribbed, yellowish white; whorls 6, scarcely convex, 

 slightly carinate at the suture, the last whorl with angulated peri- 

 phery, the angle evanescent near the aperture, base convex, less 

 strongly striate; peristome acute, slightly thickened within. 



Diam. 15 mill. 



Egypt. 



Is possibly a synonym or a variety of the preceding species. 



H. PHILAMMIA, Boiirg. PI. 5, figs. 9, 10. 



Narrowly perforate, opaque, chalky, rugosely, subtubercularly 

 costate above, less roughly so below, whitish, faintly banded on the 

 base ; whorls 6?, tubercularly carinated at the suture and on the 

 periphery, last whorl suddenly deflected in front, base convex; 

 peristome acute, thickened within. Diam. 13 mill. 



Egypt, Syria. 



One of a series of species whose differences may be only varietal. 



H. TUBERCULOSA, Conrad. PI. 5, figs. 16, 17. 



Narrowly perforate, opaque, cretaceous, corrugately striated, and 

 tubercularly bicarinated, irregularly rugose below, yellowish white; 

 whorls 6, flattened, periphery strongly tubercularly carinated, base 

 a little convex ; peristome acute, slightly labiate within. 



Diam. 12-13 mill. 



Palestine. 



H. Despreauxii, Bourg., is a synonym. 



H. DESPREAUXII, d'Orb. PI. 5, figs. 18, 19. 



Perforate, rugosely tuberculate, calcareous, whitish, carinate ; 

 whorls 5, somewhat exserted, tubercularly bicarinated, the lower 

 carina more prominent ; aperture brownish, peristome simple, acute, 

 margins approaching, connected by a callus. Diam. 8 mill. 



Canary Is. 



