HELIX. 163 



Connected by a thin callus, basal margin straight, thickened within, 

 with a long tooth, a little tuberculate. Diam. 27, alt. 15 mill. 



(Quaternary of Ins. Grand Canary, near Agaete. 

 The more salient characters are the solidity, the serrate striation 

 and the obscure malleation. The granulation is visible only under 

 .a lens. 



H. ETHELEMA Mabille, 1882. PL 49, fig. 31. 



Imperforate, depressed-subglobose, thick, scarcely shining, yellow- 

 ish, tinged slightly with red, irregularly striate, and densely, finely, 

 granulate, with five indistinct narrow, somewhat interrupted brown 

 bands; spire subconvex, apex obtuse, shining, granulose; whorls 5, 

 the outer very rapidly increasing, the first two subplanulate, separat- 

 ed *by distinct, sometimes crenulated sutures; aperture oblique, 

 lunate, oblong-ovate, margins subparallel, somewhat approximating, 

 joined by a white punctulate callus; peristome thick, broadly rather 

 flatly reflexed, columellar margin adnate, with a long tooth inside, 

 an appressed callus at the insertion and an obtuse angle at junction 

 with outer lip. Diam. 27, alt. 13 mill. 



Ins. Grand Canary. 



Allied somewhat with H. gomerensis; but with more elevated 

 spire, last whorl more angular, peristome much thickened and 

 dilated. 



H. AGAETANA Mabille, 1883. PL 46, figs. 64, 65. 



Imperforate, subdepressed-globqse, rather thick, solid, opaque, 

 greyish rufous, with three or four interrupted bands, color and 

 cuticle frequently deciduous, densely costulate-striate, and crispate- 

 malleate, above (under the lens) very minutely pustulose, below 

 flatte*ned-turgid ; whorls 6, a little convex, regularly and rapidly 

 increasing, separated by distinct sutures ; body-whorl large, convexly 

 rounded, more or less angulate at the periphery, deeply deflexed at 

 the aperture, and strongly constricted at peristome ; aperture oblique, 

 lunate, irregularly subtriangular-ovate, peristome slightly thickened, 

 widely, flatly expanded, somewhat reflexed, thin, subfragile, dull 

 reddish or yellowish, margins converging, subapproximating, joined 

 by a conspicuous lamina, the outer subsinuous, basal somewhat 

 straight, adnate, with a prominent elongate, generally white lamelli- 

 form tooth. Diam. 28-30, alt. 14-16 mill. 



Ins. Grand Canary, near Agaete. 



Allied to H. galdarica, but with the peristome of H. sarcostoma. 



