HELIX. 197 



creasing the last not descending; base slightly convex; aperture 

 oblique, lunar, peristome straight, margins remote, the right short, 

 simple, the basal sensibly thickened toward its insertion, and briefly 

 ascending. Diam. 11, alt. 8 mill. 



St. Miguel, Azores. 



None but the original specimens (communicated to Pfeiffer by Mr. 

 Cuming) are known. It seems to be near H. caldeirarum in form, 

 but differs from all Leptaxis of the Azores in the solid texture. 

 Pfeiffer's description is translated above. 



H. TERCEIRAXA Morelet, 1857. PL 51, figs. 36-38. 



Imperforate, depressed-conoid, slightly solid, densely, rather rude- 

 ly striate, and covered with an excessively minute granulation, cor- 

 neous brown, variegated with maculations and streaks of opaque 

 pale yellowish ; whorls 6, somewhat convex, Avith well marked su- 

 tures, slowly widening, the last obtusely angulate; base somewhat 

 flattened, indented in the center, anteriorly briefly descending ; aper- 

 ture oblique, ovate-lunar, peristome straight, margined within, slight- 

 ly expanded, livid; outer margin acute, columellar callous, flatten- 

 ed, entering. Diam. 12, alt. 7 mill. 



Ins. Terceira, Azores. 



Allied to If. caldeinmnn, but less diaphanous, more coarsely and 

 roughlv striate, and the columellar margin, toward its insertion, is 

 broader, owing to the larger umbilical perforation covered by its 

 expansion. 



II. i>i:oi;i:TrANA Morelet, 1860. PI. 51, figs. 29-31. 



Imperforate, globose-conic, somewhat solid, rugose-striate, yellow- 

 ish, variegated with corneous radiations and a blackish interrupted 

 peripheral fascia ; spire conic, apex rather acute ; whorls 6, slightly 

 convex, the last briefly descending; aperture ovate-lunar, marbled 

 with white within ; peristome obtuse, labiate, the superior margin 

 scarcely expanded, the columellar flattened, entering. 



Diam. 13, alt. 9 mill. 



/HX. Fayal, Azores. 



In this form the corneous surface is almost covered by the opaque 

 yellowish-white markings (which in H. azorica only speckle the shell), 

 the spire is conic, as in H. caldeirarum, and the shape of the base, 

 which is indented in the center, is very similar to that species; the 

 aperture is broader than long, and the peristome livid in color. The 

 variegated appearance reminds one of H. erubescens ; and the illu- 

 sion is increased by a very slight malleation. 



