56 HELIX-LEUCOCHROA. 



L. HISPANICA Westerlund. PI. 21, figs. 1, 2, 3. 



Shell depressed-globuloid, covered umbilicate or with the umbili- 

 cus wholly closed, solid, chalky, gray-white, not shining, more or less 

 wrinkle-striate, the apex smooth, shining, submamillar, whorls 5, the 

 upper slightly convex, separated by a crenulated suture, regularly 

 and slowly increasing ; last whorl slightly dilated, angulated at the 

 periphery, the angle often becoming obsolete toward the aperture ; 

 arcuately deflexed in front, beneath convex, flat around the 

 umbilicus, into which it passes by a right angle. Aperture small, 

 semi-ovate subangulate outside ; peristome lightly thickened] mar- 

 gins joined by a thin callus, the upper margin much produced, 

 outer slightly reflexed, basal more or less dilated above the 

 umbilicus. Alt. 14, greater diam. 18, lesser Ifi mill. (Kob.} 



Almeria and Malaga, southern Spain. 



H. cariosula ROSSM., Icon, iii, p. 17, not Mich. L. hispanica 

 WESTERL., Fauna Palsearct. Binnenconch. i, p. 87. KOBELT, 

 contin. of Rossm. Icon. n. f., iii, p. 39, f. 448, 449. 



L. SAHARICA Debeaux. PI. 21, figs. 15, 16, 17. 



Shell subglobose-conoidal, exumbilicate, angulate, scarcely shin- 

 ing, chalky, white or slightly buff; irregularly striated ; spine conoid, 

 apex rather obtuse, smooth, white; suture profoundly impressed, 

 very slightly crenulated, whorls 5? slightly convex, regularly 

 widening, angulated above the suture; last whorl slightly dilated, 

 distinctly angulated in the middle but hardly carinated, deflexed in 

 front, base convex. Aperture ovate, lunate, oblique; peristome 

 thickened in adults, the outer and lower margins a little reflexed ; 

 margins parallel, insertions distant, joined by a callus; columellar 

 very little excavated, dilated at the insertion entirely closing the 

 umbilicus. Alt. 15, greater diam. 20, lesser 18 mill. (Kob.) 



Oases of the desert border, southern Or an. 



L. saharica (Deb. in sched.) KOBELT, Nachr. Bl. 1887, p. 124; 

 Iconogr. iii, p. 36, f. 439, 440. 



This seems to be a species peculiar to the Southern Oran desert 

 border, occurring with the two-toothed Macularias. The peculiar 

 suture, the slow increase of the whorls and the lusterless upper sur- 

 face remind one of the group of H. cariosula, and sunder this form 

 from the keeled varieties of H. candidissima. 





