HELIX. 35 



H. TIARELLA, Webb and Berthelot. PL 7, fig. 3. 



Very narrowly umbilicated, variegated with white and chestnut, 

 bicarinate, tubercularly plicate at the suture, apex corneous; 

 whorls 62, the last anteriorly deflected, base closely, concentrically 

 granularly sulcate ; aperture subhorizontal, circular, peristorne ex- 

 panded, continuous, solute. Diam. 7 mill. 



Madeira. 



H. GRABHAMI, Wollaston. Unfigured. Ins. Deserta Grande. 



Subsection III. HETEROSTOMA, Hartmann. 1844. 



H. LATENS, Lowe. PL 7, fig. 4. 



Narrowly umbilicated, very thin, rugulose and velvety, olivaceous 

 corneous under a blackish integument, suture impressed ; whorls 3, 

 flattened, rapidly increasing, the last not deflected in front, peri- 

 phery ciliately carinated, base convex ; peristome simple, margins 

 approximating. Diam. 7 mill. 



Madeira. 



Wollaston asserts that this species is never pilose ; yet Pfeiffer so 

 describes it. 



H. OBTECTA, Lowe. PL 7, fig. 19. 



Moderately umbilicated, somewhat solid, eroded scrobiculate, 

 subgranular, dirty white ; whorls 5, convex, the first immersed, the 

 others turgid, the last angulated above, deflected in front ; aperture 

 subcircular, peristome continuous, scarcely expanded, subthickened 

 within. Diam. 10 mill. 



Is. Porto Sancto, and Ilheo de Baxo, Madeira. 



H. PAUPERCULA, Lowe. PL 7, fig. 5. 



Widely umbilicated, very minutely granulated, greyish, with 

 brown dots, flattened above, convex below ; whorls 3 2-4, the last 

 angulated above, angularly constricted at the aperture ; peristome 

 sub-duplicate, brownish, usually toothed within the right margin. 



Diam. 5 mill. 



Madeira, Porto Sancto. 



H. semiteda, Ilartm., and H. trachelodes, Menke, are synonyms. 



Subsection IV. IRUS, Lowe. 1854. 



H. SQUALIDA, Lowe. PL 7, fig. 10. 



Narrowly umbilicated, solid, rugulosely substriate, opaque, dirty 

 white, suture moderate ; whorls 5, flatly convex, the last shortly 



