HELIX. 181 



H. INUTILIS Mousson, 1872. PI. 50, figs. 3, 74. 



Umbilicate, convex-orbicular depressed, strongly obliquely costate, 

 the ribs cut into granules by incised lines, interstices striate, pall- 

 brownish, unicolored, lighter below; spire obtuse conic, apexstriatu- 

 late, suture impressed, not margined; whorls 4s, subconvex, scarcely 

 turgid near the sutures the last abruptly descending, transversely 

 inflated and strongly constricted, with an evanescent angle, rounded 

 below; aperture very oblique, rounded-oval, white; peristorne acute, 

 broadly flatly reflexed, sublabiate within, the margins scarcely 

 separated, joined by a thin callus, the basal straightened in the 

 middle, not adnate, sub-duplicate within. Diani. 17, alt. 9 mill. 



Ins. Teneriffe, Canaries. 



Resembles If. plicaria in sculpture and aperture, but with an 

 umbilicus like H. planorbella. 



H. PLUTONIA Lowe, 1861. PL 61, figs. 1, 2. 



Partly covered umbilicate, subglobose-depressed, solid, above 

 striate and with oblique series of granules (like hair scars and rather 

 sparce), brownish, periphery obtusely angular, in the young acutely 

 carinated, subciliate, below nearly smooth, whitish; spire slightly 

 elevated, apex minute, very finely granulate-rugose; suture carinato- 

 marginate, impressed at the last whorl; whorls 6, the upper flattened, 

 the last somewhat descending, slightly convex below the suture, 

 moderately convex below; aperture oblique, lunate-oval, submargari- 

 taceus-white within ; peristome slightly thickened, white, its margins 

 remote, subconverging, parietal callus slight or absent, the upper 

 narrowly, the basal strongly reflected, dilated near its insertion, half 

 covering the umbilicus. Diam. 25, alt. 12-13 mill. 



Ins. Lanzarote and Fuertaventura, Canaries. 



H. SEMITECTA Mousson, 1872. PL 61, figs. 98, 99. 



Partly covered perforate, convex orbicular-depressed, strongly 

 irregularly striate and granulate, shining, whitish, with four brown 

 bands, three above, one below the periphery, interrupted by angular 

 white maculations, nearly destitute of cuticle ; spire depressed-conic, 

 apex flattened, finely rugose-granulate; suture subimpressed, sub- 

 irregular; whorls 5, slightly convex above, the last somewhat 

 depressed, not angulate, briefly descending anteriorly, slightly gib- 

 bous and constricted, base not granulate in the middle, rounded 

 toward the umbilicus, which is one-ninth of the diameter; aperture 

 very oblique, small, rounded oval; peristome obtuse, a little ex- 



