162 HELIX. 



vex, irregularly, the last very rapidly, increasing, separated by 

 impressed sutures; last whorl large, angular, laterally compressed, 

 obliquely turgid before, below flattened turgid, suddenly deflexed 

 and constricted at the aperture; aperture slightly oblique, lunate, 

 oblong-subquadrate, margins subconverging, joined by a thin callus; 

 peristome obtuse, subreflexed, thickened, the columellar margin 

 nearly straight, excavated inside, adnate at the insertion of the 

 callus, outer margin regularly curved. 



Diam. 24-27, alt. 12-14 mill. 



Quaternary of Ins. Tenerijfe, near Anaga. 



Differs from H. helygaia in the very pronounced gibbosity of the 

 last whorl, the smallness of the aperture, thinner peristome, and less 

 convex whorls of the spire. 



H. GALDARICA Mabille, 1883. PI. 49, fig. 26. 



Imperforate, depressed-convex, rather thick and solid, costulate- 

 striate, under a lens very finely granulate, destitute of luster and 

 cuticle, above reddish brown, with more or less intense zones which 

 are covered with white points; spire conic, apex obtuse, mamillate, 

 rugose-striate, whorls 5, rather convex, regularly, rapidly increas- 

 ing, separated by impressed sutures; body-whorl large, flatly rounded, 

 obtusely angled at periphery, descending, subdilated, and deeply 

 constricted at the aperture, subplanulate below; aperture oblique, 

 widely ovate-elongate, lunate, peristome subthickened within, white, 

 very widely expanded, subreflexed, fragile, acute, the margins sub- 

 approximating, joined by a rather thick callus, the basal margin 

 substraightened, with a prominent thick contorted tooth within. 



Diam. 33, alt. 16 mill. Ins. Grand Canary. 



Spire more elevated and prominent, suture more marked, sculp- 

 ture of last whorl more regular than in H. agaetana. 



H. LEDRUI Mabille, 1885. PL 40, fig. 12. 



Imperforate, depressed-globose, solid, opaque, destitute of epider- 

 mis, ornamented with four bands of reddish brown, frequently 

 interrupted, and striate, especially at the sutures, lightly granulate 

 and a little decussated; spire convex; apex minute, smooth, shining; 

 whorls 5%, slightly convex, irregularly increasing, suture well im- 

 pressed; last whorl very large, angular, but deprived of the angle 

 toward the aperture, and suddenly deflected, somewhat constricted ; 

 aperture lunate, subhorizontal, irregular oblong; peristome widely 

 reflected, upper and lower margins subparallel, not converging, 



