236 HELIX. 



eter and altitude are about equal, and the sculpture is very .sharp ; 

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

 leation of ff. 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. asp* r*n. 

 is intermediate between If. mazzullii and H. aspersa in form and 

 sculpture. 



H. SUBPLICATA Sowerby, 1825. PL 67, fig. 99, 



Imperforate, 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 

 I? coarsely corrugated in the direction of the growth lines ; spire 

 conic, very obtuse, the first H 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 ail others in the large, clumsy 

 apex, granulate surface, etc. 



* ^ * 



Pomatia Beck, s. str., 1837. 

 H. POMATIA Linn., 1758. PI. 58, figs. 39-41. 



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

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

 width; coarsely, irregularly obliquely striatc. 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. 



Middle and Northern Europe. 



The synonymy includes the following names : H. an\ 

 Leach, pomaria Mull., scalaris Mull., *phi.t:i-iili* Hartm., 

 Studer, mutata Hartm. and inflata Hartm. 



