128 HELIX. 



H. MICROPHIS, Crosse. PI. 26, figs. 25, 26. 



Plan orb iform, very widely umbilicated, longitudinally striate,. 

 olivaceous corneous, suture impressed ; whorls 4, narrow, the last 

 descending in front ; aperture auriform, narrow, whitish, peristome 

 continuous, white, thick, the parietal callus rising into a central 

 tooth. Length, 13*4 mill. 



Noumea, New Caledonia* 



An aberrant form for which Mr. Ancey has recently proposed a 

 sectional name, Micropliyura. 



H. RAFFRAYI, Tapparone-Canefri. PI; 26, figs. 99, 100. 



Widely, deeply umbilicated, showing all the whorls, shell conical 

 above, whorls flat, periphery sharply angulated, base convex ; lon- 

 gitudinally striate, diaphanous ; ashy corneous, the carina fulvous ; 

 whorls 10*, the last deflected and subconstricted at the aperture ; 

 aperture obliquely subquadrangular, periphery expanded, the mar- 

 gins joined by a parietal callus. Diarn. 10 mill. 



New Guinea. 



Unfigured Species. 



H. PLATYGYRA, Albers. R. Maranon, Columbia* 



H. STENOSTREPTA, Pfr. Tofropoto, Andes of Peru. 



Subsection II, POLYGYRA, Say, 1817. 



H. CHEILOSTROPHA, Orbigny. PL 26, figs. 32-34. 



Widely umbilicated, closely plicate, brownish ; whorls 6J-7, 

 moderately convex, the last dilated in front and scarcely deflected ; 

 aperture a little oblique, trisinuately lunar, lip shortly reflected, 

 bidentate within, with a large tongue-like lamina joining its extremi- 

 ties. Diam. 8 mill. 



Sta. Cruz de la Sierra, Bolivia. 



H. CEREOLUS, Muhlfeldt. PL 26, figs. 27-31 ; PL 27, figs. 35-42. 



Umbilicated, subdiscoidal, showing the whorls above and below, 

 obliquely striate, whitish or light corneous, sometimes with radiat- 

 ing, opaque white maculations; whorls 5-12, narrow, the last 

 scarcely descending, with obtusely angulated periphery; aperture 

 diagonal, reniform, peristome thickened, lip angularly reflected, the 

 margins joined by a triangular tooth-like parietal callus, parietal 

 wall often with a deep seated lamina, Diam. 9-15 mill. 



Georgia, Florida-Louisiana, Bermuda, Bahamas. 



