172 HELIX. 



by a very narrow white zone, and perceptibly crenulated ; body- 

 whorl large, rounded-sloping, subangulate, gently descending at the 

 aperture and very strongly constricted ; aperture very oblique, 

 irregularly lunate-oval, peristome not reflexed, broadly, flatly ex- 

 panded, white within, yellowish without, margins approximating, 

 joined by a white callus, the columellar a little straightened, denticu- 

 late, adnate at the appressed umbilical callus. 



Diam. 23-25, alt. 14-15 mill. 



Ins. Teneriffe, Canaries. 



A very distinct form, remarkable for the regularly conic spire, 

 brilliant peristome, and incised decurrent lines. 



H. CACOPERA Mabille, 1883. PL 49, fig. 34. 



Imperforate, thick, opaque, irregularly striate, dull purplish, very 

 irregularly malleate, especially upon the last whorl, under a lens 

 very finely granulate, the upper whorls smooth ; spire depressed- 

 conic, little elevated, apex punctulate, shining, obtuse, concolored ; 

 whorls 5, rapidly increasing, separated by impressed sutures ; body- 

 whorl large, angulose-rotund, flattened and impressed in the centre 

 beneath, toward the aperture regularly descending, subconstricted 

 and slightly gibbous ; aperture oblique, lunate, transversely trian- 

 gular ; peristome flatly expanded, not reflected, the margins subdis- 

 tant, columellar margin straightened, thick, white, excavated, 

 lengthily adnate, briefly appressed at insertion, joining the broadly 

 arcuate outer lip at an angle. Diam. 21, alt. 10 mill. 



Ins. Gomera, Canaries. 



Differs from H. consobrina in the more compact coiling of the 

 whorls, the last one simply rounded, not inflated; the peristome 

 is slightly thickened, flat, angular at the junction of the columellar 

 and outer margins, not reflexed and callous as in H. consobrina. 



H. BATHYCLERA Mabille, 1885. PL 49, figs. 23-25. 



Imperforate, convex-depressed, solid, opaque, slightly shining, 

 rudely striate, obscurely malleate, yellow reddish, with five sub- 

 evanescent blackish bands, interrupted with yellow; spire convex, 

 apex shining, purplish, punctulate ; whorls 5, regularly, rapidly in- 

 creasing, separated by impressed sutures; body-whorl large, inflated 

 above, concave below, subdilato-compressed toward aperture, sud- 

 denly shortly deflexed and a little constricted behind the peristome; 

 aperture lunate, oblique, irregularly triangular-ovate; peristome 



