152 HELIX. 



H. SARCOSTOMA Webb et Berthelot, 1832. PL 49, figs. 49, 50. 



Imperforate, globosely depressed, solid, flesh-tinted or yellowish r 

 with four dark frequently interrupted bands, sometimes obsolescent, 

 the whole, surface, including apex, covered by an extremely minute 

 dense granulation, rather obscurely irregularly obliquely striate, 

 sometimes with inconspicuous vermiform anastomosing reticulating 

 wrinkles upon the last whorl, upon which are short white marks in 

 the direction of the whorls ; apex rather obtuse ; sutures well-marked ; 

 whorls 5, the outer rapidly increasing and wide, rounded, tumid, 

 especially below, deeply descending to the aperture ; not constricted ; 

 aperture very oblique, rotund-lunate ; peristome very ividely expanded 

 and flattened, pale fleshy-white colored, very regularly arched, its 

 margins converging and joined by a thin callus, appressed over the 

 umbilical tract, and very slightly thickened within, scarcely sub- 

 dentate. Diam. 30, alt. 20 mill. 



Ins. Lanzarote, Fuertaventiira and Grand Canary* 



Specimens of 25 mill. diam. or less are frequent. I see nothing 

 more than varietal characters in the following form, but admit it 

 provisionally at this time. 



H. THAUMALEA Mabille, 1882. PL 47, figs. 87, 88. 



Shell subglobose, solid, somewhat opaque, striate, all over very 

 finely granulate and superficially obscurely crispato-malleate, 

 smoother below, ruddy with scattered white spots and four or five 

 brown or blackish bands more or less intense and interrupted ; spire 

 convexo-depressed, apex reddish, obtuse, shining, rugose-punctate; 

 whorls 5, the last most rapidly increasing, separated by impressed 

 sutures ; body-whorl very large, rounded-tumid, inflated below,, 

 slightly descending and deflexed at aperture ; aperture very oblique, 

 lunate, suboblong-ovate, the ends subapproximating, joined by a 

 callus ; peristome thick, dilated, reflexed, whitish, tinted with yellow, 

 strongly thickened "within, columellar margin contorted, shining, 

 appressed, with an elongate lamellose tooth. 



Diam. 31-33, alt. 14-16 mill. 



Ins. Lanzarote and Fuertaventiira, Canaries. 



Shell thicker than H. sarcostoma ; spire more depressed ; the um- 

 bilical callus is very heavy and livid white in color. 



H. PAETELIANA Shuttleworth, 1859. PL 50, fig. 80. 



Imperforate, depressed conoid-globose, thin, striulate, and slightly 

 granulate, shining, fulvous olivaceous, ornamented with five deep 



