HELIX-HELICELLA. 165 



Section Helicella Moq.-Tand. 



H. CESPITUM Drap. (Vol. Ill, p. 241). PI. 39, figs. 36-42. 



The illustrations here given represent Algerian forms, collected 

 by Kobelt. Figs. 40, 41, from near Coustantine ; fig. 37 represents 

 a specimen from Akbon, in the valley of the Sahel, which is said by 

 Kobelt to be the most beautiful specimen ofcespitum brought by him 

 from Africa, and by him is called var. sabatieri. Figs. 38, 39 are 

 from one of the large white specimens, common in the Province 

 Constantine. 



H. CALOPSIS Bourguignat. (Vol. Ill, p. 227). PI. 38, figs. 1-4. 



Figures from Kobelt are here given showing the mature shell of 

 this species, which was not known to Bourguignat. 



Environs of Cherchell, north coast of Algieria. 



H. SITIFENSIS Bourguignat. PI. 39, figs. 32, 33. 



Shell broadly but in part covered umbilicate, depressed, globose, 

 rather solid, chalky, little shining ; white, sometimes with traces of 

 brown streaks ; irregularly striated, the last whorl malleated and 

 marked with irregular impressions; whorls from 6 to 6J, regularly 

 increasing, separated by an impressed linear suture, convex ; the 

 last whorl cylindrical, generally descending slowly in front. Aper- 

 ture subcircular, lunate, slightly tinted with buff inside; peristome 

 thin, acute, margined within with buff-brown, then having a thin, 

 narrow, white lip ; margins converging, scarcely connected, col- 

 umellar margin dilated at the insertion and reflected partly over 

 the umbilicus. (Kob.~) 



Alt. 18-19, greater diam. 25, lesser 22 mill. 



Near Setif, Province of Constantine, Algiers. 



H. setifensis Bgt. in LETOURNEUX, Exc. en Kalybie. KOBELT, 

 Kossm. Icon. n. f. iv, p. 88, f. 685, 686. 



This is always distinguished from cespitum by the yellow-brown 

 edge within the lip. 



H. MONERIANA (Bourg.) Kobelt. PI. 39, figs. 25-29. 



Shell profoundly umbilicate, the umbilicus varying much in size, but 

 partly covered by the reflected peristome ; the form very variable, 

 varying from depressed-globose to conic-globose ; strong, chalky, but 

 somewhat shining ; unicolored white with a few scattered blue-black 

 dots, the upper whorls closely regularly ribbed-striate, the lower irre- 



