236 HELIX. 



eter and altitude are about equal, and the sculpture is very j-harp ; 

 but forms also occur with less rough surface and traces of the mal- 

 leation of H. aspersa. Bourguignat has called the banded form var. 

 zonata ; and has given the name of H. quincaycensis to the very narrow 

 elevated form shown in my fig. 57. An Algierian form of H. asperan 

 is intermediate between H. m<iszuUii and H. aspersa in form and 

 sculpture. 



H. SUBPLIC-ATA Sowerby, 1825. PI. (i7, tig. !>!), 



Iinperforate, globose-conic, thin and rather fragile (fossil exam- 

 amples heavier) yellowish brown, the upper two whorls deep dull 

 reddish brown ; upper whorls densely minutely granulate ; the last 

 la- coarsely corrugated in the direction of the growth lines ; spire 

 conic, very obtuse, the first !} whorls disproportionately large; sut- 

 ure deeply impressed; whorls 3', the last large, globose, gently de- 

 flexed anteriorly ; aperture oval, oblique, its margins converging 

 and joined by a slight (or in fossil examples very heavy) parietal 

 callus ; peristome slightly thickened, scarcely expanded, reflexed 

 and adnate over the axis. Diam. 32, alt. 32 mill. 



Ins. Porto Sancto, Madeiras. 



A curious form, very distinct from all others in the large, clumsy 

 apex, granulate surface, etc. 



* * * 



Poinatia Beck, s. str., 1837. 

 H.POMATIA Linn., 1758. PI. 58, figs. 30-41. 



Perforate or umbilicate, globular, strong, opaque, yellowish brown 

 or whitish, indistinctly marked with four darker /ones of variable 

 width; coarsely, irregularly obliquely striate. decussated with mi- 

 croscopic impressed lines; spire short, conoid, apex blunt, apical 

 whorl smooth, shining; sutures well impressed : whorls 4'., convex, 

 the last very large, globose, -rapidly widening, indented around the 

 umbilicus, scarcely deflexed anteriorly; aperture oblique, oval- 

 lunate ; peristome slightly expanded, somewhat thickened, the col- 

 umellar margin reflexed above the umbilicus; parietal wall, interior 

 of aperture and columella white or light flesh color. 



Diam. 45, alt. 45 mill. 



Miifdfe mid Xorthent Europe. 



The synonymy includes the following names: H. antiquorum 

 Leach, jii>iii<irin Miill., scn'luri* Mull., xj>lt<rru/i.-< Hart in., (ucorinii 

 Studer, ntittt Hartm. and inftata Hartm. 



