190 HELIX. 



the wrinkles more or less irregular, wavy, shining, more obliquely 

 descending than the lines of growth ; spire conic, more or less de- 

 pressed, apex nearly smooth ; suture well impressed ; whorls 5i, 

 convex, the inner gradually, the last rapidly widening, deeply de- 

 flexed anteriorly ; aperture very oblique, regular rounded-lunar,, 

 wide ; peristome slightly subexpanded and labiate, margins con- 

 verging, the columella entering, briefly expanded and appressed 

 over the umbilical tract. Diam. 24-30, alt. 16-20 mill. 



Madeira* 



H. corrugata (Soland. MSS.) Lowe, H. groviana Fe"r., and H~ 

 scabra Wood are synonyms. 



H. VULCANICA Lowe, 1852. PI. 50, figs. 95, 96; pi. 52, fig. 76. 



Imperforate, depressed-conic, thin, greenish yellow, with two (sub- 

 sutural and supra-peripheral) dark brown bands frequently interrup- 

 ted by the lighter color; obliquely sculptured with coarse irregular 

 wrinkles, base much smother; whorls 5, the inner gradually, the 

 last rapidly widening, convex, apex slightly rugose; body whorl 

 rather flattened, descending anteriorly; aperture oblique, regular 

 rounded lunar; peristome slightly expanded and labiate, its ends 

 converging, the columellar margin directly entering, slightly ex- 

 panded. Diam. 23, alt. 14 mill. 



Northern and Central Desertas, Madeira Is* 



This species and the next are separated from H. undata by their 

 variegated coloration and the much less coarse currugation of the 

 surface, which, however, as in the undata is as obvious inside as 

 outside, on account of the thin shell. 



H. LEONINA Lowe, 1852. PI. 51, figs. 23, -24; pi. 52, fig. 77. 



Like H. vulcanica, but more globose and turbinate, the base 

 more convex, mouth rounder, coloration deeper, the bands scarcely 

 or not interrupted. Diam. 26-30, alt. 18-20 mill. 



Southern and Central Desertas, Madeira Is. 



Scarcely distinct from the last species. 



H. NIVOSA Sowerby, 1824. PL 51, fig. 18; pi. 52, figs. 78-80. 



Imperforate, globose-turbinate, yellowish-brown, generally with 

 broad dark spiral bands, and a narrow light peripheral fascia, the 

 whole surface sculptured with rather coarse oblique whitish wrinkles, 

 and an excessively minute granulation ; spire conic, subacute ; 

 suture well-marked ; whorls 5, the last rapidly widening, full and 

 well-rounded toward its termination, and deeply descending ; aper- 



