138 HELIX. 



very oblique, transversely truncate-oval, peristome white, sublabiate, 

 the ends converging and connected by a light callus, the columella 

 with a heavy dentiform callus. Diam. 30 mill. 



Zaffarine Is., and adjacent mainland. 



Var. ZELLERI Kobelt. PI: 41, fig. 38. 



Smaller, more globose, with four interrupted brown bands, mac- 

 ulated in the interspaces ; aperture smaller and less intensely colored 

 than in the typical H. zaffarina. Diam. 27 mill. 



Mascara, Algiers. 



H. doubletti Bourg. is a synonym. 



H. ANOTERODON Pechaud. PI. 46, figs. 43, 44. 



Covered umbilicate, conoid-globose, solid, chalky, white, irreg- 

 ularly rudely striate, with subtle spiral impressed lines, body-whorl 

 distinctly malleate ; spire conoid-convex, apex small, white, suture 

 above linear, becoming impressed ; whorls 6, convex, regularly in- 

 creasing, the last tumid, slightly dilated, suddenly deeply deflexed 

 at aperture ; aperture very oblique, lunate, semiovate, deep brown 

 within, upper and lower margins parallel, scarcely converging at 

 extremities, the upper at first rather straight, then becoming patulous, 

 outer margin dilated, reflexed, white, with a white dentiform incurved 

 strong lamella, basal margin castaneous on its upper part, declivous, 

 with an abruptly truncated strong, somewhat transversely placed 

 tooth on its anterior edge ; parietal wall and throat deep brown. 



Diam. 30 J, alt. 22 mill. 



Environs of Leila Marnia, on the Morocco boundary. 



I follow Kobelt's identification of this form. It has the appear- 

 ance of If. tigri and other forms of that group ; but Kobelt says : 

 " Es ist eine Helix zaffarina mit einem Gaumenzahn. Zur Gruppe 

 der saharischen Zweizahner mochte ich sie nicht rechnen." 



H. DUPOTETIANA Terver. PI. 41, fig. 39. 



Imperforate, subglobose, white, irregularly striate and malleate, 

 with four or five brown bands, often coalescent or wanting ; whorls 

 5, the upper ones planulate, last two convex, the last strongly de- 

 flected at the very oblique, broadly lunate aperture ; peristome 

 brownish, reflexed, sublabiate, columellar margin brown, thickened, 

 with a decided tooth ; fauces deep brown. Diam. 30-35 mill. 



Or an, Algiers. 



Perhaps not specifically distinct from H. zaffarina Terver. 



