170 HELIX-HELICELLA. 



within ; margins converging but not joined by a callus ; the columellar 

 margin is hardly dilated at the insertion. (Kob.~) 

 Alt. 7, greater diam. 12, lesser 10 mill. 



Tetuan, Algiers, on fronds of the dwarf Palm. 



H. heynemanni KOB., Nachr.-bl. D. M. Ges. xv, 1883, p. 114; 

 Rossm. Icon. n. f. iv, p. 22, f. 541. 



Allied to H. andalusica, but sufficiently different in the chalky 

 texture, rib-sculpture, etc. 



H. GOUINI Debeaux. PI. 38, figs. 14, 15, 16. 



Shell depressed, the spire a little convex, the umbilicus rather 

 broad, rapidly narrowing as it penetrates, one-fifth to one-sixth the 

 diameter of the shell. Solid, opaque ; ground color white, the upper 

 surface light brown ; having numerous interrupted bands and lines 

 of chestnut, of which one above the periphery is most constant ; often 

 having a series of alternately dark and light spots below the suture. 

 Surface sculptured with close, strong, curved white rib-strice. 



Apex minute, the first whorl small, shining, dark chestnut colored ; 

 following whorls slightly convex, the last rounded at the periphery 

 and below, slightly descending in front. Aperture nearly circular, 

 but the penultimate whorl cuts a segment of 90 from the circle ; 

 peristome having a rather strong flesh-colored rib within. 



Alt. 10*, diam. 16* mill. 



Alt. 9J, diam. 16 mill. 



Salt pits of Fleurus and St. Louis, near Oran, Algiers. 



H. gouini (Deb.) KOBELT, Rossm. Icon. n. f. iv, p. 90, t. 116, 

 f. 699. 



Very closely allied, says Kobelt, to H. colomiesiana Bgt. ; but it 

 is much more widely umbilicated than that species, if I may judge 

 colomiesiana by the figures. The surface is unusually well adorned 

 with white riblets, and some specimens exhibit alternate dark and 

 light dashes under the suture. My description is from specimens 

 from the collection of John Ritchie, Jr. 



H. BOLLENENSIS Locard. PI. 38, figs. 23, 24. 



Shell globose-depressed with conoidal spire, umbilicated, the 

 umbilicus narrow, about one eighth the diameter of the shell ; solid, 

 opaque, white, more or less suffused with rufous, or having numerous 

 indistinct, very light tinted brown bands. Surface hardly shining, 



