HELIX. 137 



aperture subhorizontal, oblong-ovate, deep brown inside ; peristome 

 expanded, obtuse, its edge white, and its margins slightly converging, 

 connected by a brown callus; basal margin thickened, subdentate. 

 Diam. 32 mill. 



Mazagran and Mostaghanem, Algiers. 



H. ARICHENSIS Debeaux. PI. 41, figs. 34, 35. 



Depressed globose, slightly dilated transversely, solid, irregularly 

 rugoselv striate, and marked with short impressed transverse lines; 

 chalky white, obscurely four banded ; whorls 6, slightly convex, 

 gently increasing ; sutures distinct ; last whorl subinflated, strongly 

 deflexed anteriorly, subexcavated around the umbilical area ; aper- 

 ture very oblique nearly horizontal, chestnut colored within, margins 

 converging ; peristome expanded, subreflexed, ad n ate at base ; colu- 

 niella with a heavy callus. 



El Arich, District of Muhiju, Algiers. 



Var. CRASSIDENS Debeaux. PI. 41, fig. 36. 



More globose than the type, with the colurnellar plication strongly 

 developed. 



H. LOBETHANA Debeaux. PL 46, figs. 49, 50. 



Covered umbilicate, depressed trochoidal, solid, rudely irregularly 

 striatulate, more or less malleate toward the aperture, white with 

 four pale brown sharply defined bands, apex smooth, obtuse ; suture 

 impressed ; whorls 5, regularly and rapidly increasing, the last 

 rounded, convex below, dilated, deeply deflected anteriorly ; aperture 

 very oblique, wide ovate ; peristome acute, somewhat thickened in- 

 side ; margins not approaching, and connected by a thin brownish 

 callus; columella margin with a sharp truncate pliciform callus. 



Diam. 33, alt. 21 mill. 



Separated from H. arichensis by the convex not excavated umbil- 

 ical tract, but probably not specifically distinct. 



H. ZAFFARINA Terver. PI. 41, fig. 37. 



Imperforate, conoid, depressed-globose, solid, chalky white, deep 

 brown within the aperture, irregularly striate and malleate, with 

 impressed short transverse marks, most developed behind the broadly 

 expanded lip; whorls 5, nucleus large, smooth, upper ones flattened, 

 the last widened at the aperture and abruptly deflexed ; aperture 



