HELIX. 169 



very abruptly deflexed at aperture, and grooved behind the peri- 

 stome ; aperture irregularly triangular-trilobate, the peristome white, 

 at the upper angle produced downward into a lobe or tooth, the 

 outer lip with a similar but narrower tooth, columellar margin 

 substraightened, thickened within, adnate to the gibbous base. 



Diam. 20, alt. 14 mill. 



Ins. Teneriffe, Canaries. 



Lamarck published this species as H. bidentalis before the descrip- 

 tion of malleata was published. But. since the species is universally 

 known by the latter name it is scarcely advisable to change. 



A well known and easily recognized species, quite variable in the 

 development of the peristome and in size ; extreme specimens meas- 

 ure: Diam. 24, alt. 16 mill., and forma minima, diam. 12 mill. 



Yar. NIVARIJK Wollaston. 



Larger than the type ; body- whorl not keeled, less deflected 

 anteriorly ; aperture more triangular, peristome more thickened, 

 more reflexed, margins less converging, the basal more straightened, 

 the upper margin with the teeth nearly obsolete. 



Diam. 22, alt. 13 mill. 



Ins. Teneriffe. 



H. GLASIANA Shuttleworth, 1852. PI. 49, figs. 40, 41. 



Imperforate, depressed globose, solid, above grayish yellow, more 

 or less streaked and suffused with the dark coffee color of the bands, 

 which are five in number, the upper ones generally interrupted, 

 often broken into oblique streaks, the peripheral and lower bands 

 wider, usually continuous, base dull yellow; spire conic-convex, apex 

 obtuse; suture well marked; whorls 4-4?, the first minutely granu- 

 late, the following densely granulate, irregularly obliquely striate, 

 the striae mostly broken into coarse granules, below the periphery 

 almost smooth; body-whorl not angular, well rounded, the last third 

 very gibbous below, widened toward the aperture, somewhat deflexed, 

 lightly constricted; aperture oblique trigonal,, subtrilobate ; peri- 

 stome much thickened, narrowly reflected, bearing on the upper 

 outer margin an obtuse tubercular tooth, base adnate, wide, with a 

 a callous lamella within. Diam. 18-22, alt. 14-16 mill. 



Ins. Grand Canary. 



H. pellis-lacerti Reeve (fig. 40.) and H. malleata var. b. Pfr., are 

 synonyms. 



