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. 



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



H. CARTA Mabille, 1882. PI. 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, granulose-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 subcon verging,, 

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

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



Ins. Teneriffe, Canaries^ 



Related, according to Mabille, to H. paeteliana, differing in it& 

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

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



