166 HELIX. 



increasing ; suture impressed ; body-whorl large, turgid, inflated,, 

 rounded at periphery, descending and subconstricted at aperture ; 

 aperture slightly oblique, lunate, transverse oblongo-subquadrate, 

 margins subremote, joined by a shining calcareous lamina ; peristome 

 patulous, broadly reflexed, acute, thickened within, external margin 

 sinuous, columellar margin with an adnate callus, appressed at its 

 insertion, with a strong elongated tooth inside. 

 Diam. 35, alt. 18 mill. 



Foxsil at Puerto-da- Luz, Grand Canary Is. 



H. CARTA Mabille, 1882. PL 47, fig. 89. 



Shell subglobose-conic-depressed, thick, opaque, striate and rudely 

 malleate; spire conic, prominent, apex obtuse, smooth; whorls 5, 

 convex, regularly, rapidly increasing, separated by distinct sutures, 

 the last large, rounded, slightly dilated and turgid anteriorly, convex 

 below; aperture oblique, lunate, oblong-ovate, margins subdistant; 

 peristome acute, reflexed, thickened within, outer margin sinuous,, 

 columella thickened, expanded and appressed over the umbilicus,, 

 within strongly lamellose-dentate. Diam. 29-31, alt. 16-18 mill. 



Ins. Grand Canary, fossil in quaternary of Puerto-da-Luz. 



Compared with H. temperata the size of H. carta is larger, the last 

 whorl less globular, the body-whorl obviously angular in front, and 

 it lacks granulation. 



H. RETRODENS Mousson, 1872. PI. 50, figs. 68, 69. 



Imperforate, globose-convex, scarcely angled, strongly striate, in 

 part elongate malleate, shining, nearly destitute of cuticle, very pale 

 brownish-olive, white below, with three indistinct bands, interrupted 

 with streaks of white ; spire obtuse, subconoidal, apex rather large, 

 obtuse, grauulose-rugose ; sutures subimpressed; whorls 4?, slightly 

 convex, the last rapidly, deeply deflexed anteriorly, gibbously in- 

 flated and constricted behind the aperture; aperture contracted, 

 very oblique, white, subcircularly trigonal; peristome thickened, 

 white, acute, broadly, flatly reflexed, the margins subconverging, 

 joined by a thick callus, the basal with a heavy callus at the inser- 

 tion, and a recurved pliciforin tooth. Diam. 17, alt. 12 mill. 



Ins. Teneriffe, Canaries. 



Related, according to Mabille, to H. paeteliana, differing in its 

 small size, augulation of last whorl, the excavation of the umbilical 

 tract, the strong stride, white spots, and the small aperture. 



