160 HELIX. 



granulate, irregularly striate ; spire convexo-conic, slightly promi- 

 nent, apex obtuse, smooth; whorls 5*1 , convexly rounded, regularly, 

 rapidly increasing, separated by impressed sutures; body-whorl 

 large, compressed-rotund in front of the aperture, becoming rotund- 

 tumid, somewhat constricted behind the aperture, turgid below, 

 briefly, rapidly descending ; aperture slightly oblique, lunate, wide 

 oblong-subrotund, margins subdistant, joined by a callus ; peristome 

 thick, scarcely reflected, labiate within, exterior margin sinuous, 

 columellar adnate, obliquely thickened, with an appressed callus 

 and slightly excavated at the insertion of the callus. 



Diam. 30, alt. 18 mill. 



Quaternary of Ins. Teneriffe, at the lighthouse of Anaga. 



May be distinguished by its very depressed form and rounded 

 whorls, the body-whorl slightly angular at its origin, and the small, 

 regular aperture. 



H. CALLIPONA Mabille, 1882. PL 52, fig. 68. 



Imperforate, conoid-subglobose, opaque, destitute of cuticle and 

 color, densely costulate-striate ; spire conic, apex obtuse, smooth ; 

 whorls 6, convexly sloping, regularly, very rapidly increasing, 

 separated by impressed sutures ; body-whorl large, carinate, more 

 or less compressed-rotund, below convex, at the aperture deflexed, 

 subconstricted ; aperture oblique, rather small, lunate, oblong-rotund, 

 margins subdistant, joined by a thin callus, peristome thick, labiate, 

 convolutely reflexed, margins well-curved, the columellar oblique, 

 adnate, with a wide appressed callus at the insertion. 



Diam. 28-30, alt. 16-17 mill. 



Quaternary of Ins. Teneriffe, at the lighthouse of Anaga. 



Compared with H. cacoplasta this species is less depressed, more 

 globulose, whorls more rounded, less sloping, striation stronger, less 

 regular, aperture rounder, peristome thicker. 



H. PERRIERI Mabille, 1882. PL 47, fig. 77. 



Imperforate, depressed-conic, thick, opaque, destitute of color and 

 cuticle, subacutely carinated, appearing under a strong lens finely 

 decussated, costulately striate ; spire conic, slightly elevated, apex 

 obtuse, punctulate ; whorls 5 J, convexly sloping, rapidly increasing, 

 especially the outer ones, separated by linear sutures ; body- whorl 

 large, angulate, becoming compresso-dilated, below convex turgid, 

 constricted at aperture, and suddenly deflected ; aperture subhori- 

 zontal, lunate, oblong-ovate, margins distant, joined by a thick 



