140 HELIX. 



H. ODOPACHA Bourguignat. PI. 42, figs. 49-52. 



Imperforate, depressed globose, ventricose, shining, slightly sub- 

 pellucid, white, striate and malleate; apex smooth, obtuse; spire 

 convex; whorls 5, regularly increasing, the last rounded, abruptly 

 deflexed anteriorly; aperture oblique, narrow, subtriangular-oblong, 

 pale brown inside; peristorae white, thickened, patulous; columellar 

 margin thickened, bearing a heavy brownish callus, terminating in 

 a thick tubercle ; margins connected by a light callus. 



Diam. 24 mill. Oran, Algiers. 



A variety is figured by Kobelt with four narrow brown bands. 

 The species is very closely allied to H. arabica. 



H. BONDUELLIANA Bourguignat. PI. 37, figs. 67, 68. 



Imperforate, ventricose, solid, bright, chalky, lightly striate and 

 obscurely malleate, bluish-white, obscurely unifasciate; spire convex, 

 apex small, obtuse, smooth ; whorls 5J, regularly and rapidly in- 

 creasing, the last descending anteriorly; aperture oblique, lunar- 

 ovate, white within ; peristome sublabiate, expanded ; columella 

 margin with a white callus. Diam. 28 mill. 



Oran, Algiers. 



H. asteia Bourg. is more deflected at aperture and has darker 

 mouth, with the columella callus slightly more developed. Said to 

 l>e from Madrid, Spain, but referred to If. bonduelliana, by Hidalgo, 

 who considers it an African species. (PL 42, fig. 53.) 



H. SENILIS Morelet. PL 42, figs. 54, 55. 



Imperforate, globose depressed, dilated transversely, thick ; whorls 

 5j, planulate, the last dilated and deflexed anteriorly, four banded; 

 aperture truncate-oval, subhorizontal ; peristome very thick, reflexed, 

 margins connected by a callus ; columella dentate. Diam. 25 mill. 



Between Constantine and Setif, Algiers. 



H. EMBIA Bourguignat. PL 42, figs. 56-57. 



Covered perforate, depressed subglobose, solid, chalky white, 

 striatulate and malleate, spire convex, apex smooth, obtuse ; whorls 

 5 to 6, the upper ones flattened, the last two convex ; suture mod- 

 erately impressed ; last whorl rounded, tumid below, at the aperture 

 suddenly descending; aperture oblique, irregularly lunate, deep 

 chestnut within, with a tooth on the base, and opposite it a slight 

 prominence inside the outer lip ; peristome broadly expanded, lab- 

 iate, margins connected by a white callus, Diam. 23, alt. 15 mill. . 



Island of Habibas, off Algiers. 



