HELIX. 139 



H. BREVIERI Pechaud. PI. 41, figs. 40, 41. 



Large, thick, depressed conoid-globose, rough sculptured, with 

 coarse lines of increment, and on the upper whorls and near the 

 sutures with fine spiral strife ; last whorl malleate, vermieulate with 

 white anastomosing wrinkles; with four broad and faint bands on a 

 yellowish-white ground ; or unicolored chalky white ; whorls over 

 6, slightly convex, regularly increasing, the last inflated, dilated 

 and abruptly descending at the oblique, ovate-truncate aperture ; 

 peristome white, expanded, declivous at base, with a more or less 

 developed truncate dentiform callus ; aperture larger than that of 



H. dupotetiana, castaneous within. Diam. 40 mill. 



Nemoitr, Algiers. 



Kobelt's H. dupotetiana var. rugosa, and H. dupotetiana var. aspera 

 Gassies are synonyms. H. subbrevieri Bourg. may also be placed 

 here. 



H. XANTHODON Anton. PL 41, figs. 42, 43. 



Imperforate, subglobose-clepressed, white, solid, spire convex * 

 whorls 5, slowly increasing ; aperture rounded, very oblique, dark 

 brown inside, small ; peristome reflexed, white ; columella margin 

 with a heavy dentate callus. Diam. 22 mill. 



Oran, Algiers. 



Aperture smaller and whorls less rapidly increasing than in H. 

 dupotetiana, to which it is very closely allied. A variety figured 

 by Kobelt is larger, last w T horl more inflated and malleate. The 

 species is also nearly allied to H. arabiea. 



H. ARABICA Terver. PI. 42, figs. 47, 48. 



Imperforate, depressed globose, solid, shining, with three or four 

 brown bands, interrupted with white, sometimes unicolored, white; 

 spire convex; apex smooth, obtuse; whorls 5, rapidly increasing, 

 the last rounded, inflated below, descending at the very oblique, 

 oblong-lunate aperture; peristome white, thickened, expanded, colu- 

 mellar margin callously thickened, dentate and brown like the 

 interior of the aperture. Diam. 28 mill. 



Province of Oran and Adjacent Islands. 



This is not the H. arabiea of Roth, which=:.ff. desertorum Forsk. 

 H. abrolena Bourg., proposed because the name arabiea was supposed 

 to be preoccupied, is said by Ancey to be more globose, with more 

 convex and more rapidly increasing whorls, and thicker shell than 

 typical arabiea. It is figured on PI. 42, figs. 44-46. 



