176 HELIX. 



arcuate, within straightened, flattened, adnate, thin, subexcavated 

 and impressed at the insertion. Diam. 16J, alt. 11 ? mill. 



Ins. Gomera, Canaries. 



Of this little-known form Mabille says: A species intermediate 

 between If. guamartemes and H. perraudieri. It is much more 

 globular than the latter; its whorls, particularly the last are inflated ; 

 the ornamentation consists of a nearly effaced malleation, with traces 

 of granulation visible only under a strong lens. 



H. HEDYBIA Mabille, 1882. PL 48, figs. 9-11. 



Imperforate, depressed-globose, solid, striatulate, under a lens 

 punctulate or irregularly malleate-crispate, not shining, rosaceous ; 

 spire globose-convex, apex obtuse, smooth, unicolored; whorls 5, 

 convex, rapidly increasing, especially the last; suture impressed; 

 body-whorl rounded, abruptly descending, toward the aperture 

 angularly dilated, not gibbous; aperture oblique, transversely ovate, 

 margins subcon verging; peristome acute, white, thickened within, 

 columellar margin subconcave, planulate, adnate, joining the outer 

 lip with an obtuse angle. Diam. 18-20, alt. 91-10 mill. 



Canaries. 



Spire more elevated than in the H. distensa, more acute, not 

 mamillated, last whorl more obviously angled, more descending, 

 etc. From H. perraudieri the large size, globular form, solidity and 

 different sculpture will separate it. 



H. PERRAUDIEREI Grasset, 1857. PL 50, figs. 70-72. 



" Imperforate, globose-depressed, regularly and minutely malleate, 

 yellowish, apex blackish ; whorls 5, slightly convex, the penultimate 

 angulate, the last descending; aperture subangulate-lunar, peri- 

 stome reflexed, thick, white margined within and without, columellar 

 margin callous, subexcavated at the base. Diam. 16, alt. 9 mill." 



(GrassetJ) Ins. Hierro, Canaries. 



The body- whorl is subangular at its origin. The peristome is 

 generally yellow more or less pronounced. 



H. HIERROENSIS Grasset, 1857. PL 50, figs. 57-59. 



" Imperforate, subglobose, striate, minutely granulate, below yel- 

 lowish green, above with four very faint brown bands ; whorls 5, a 

 little convex, the last anteriorly descending ; aperture wide lunar ; 

 peristome reflexed ; -thickened, white, columellar margin callous. 



Diam. 21, alt. 13 mill." (Grasset.) 



Ins. Hierro. Canaries. 



H. valverdensis Lowe is a synonym. 



