128 HELIX. 



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



Planorbiform, very widely umbilicated, longitudinally striate r 

 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, Microphyura. 



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. Diam. 10 mill. 



New Guinea. 



Unfigured Species. 



H. PLATYGYRA, Albers. It. Mar anon, Columbia. 



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



Subsection II, POLYGYRA, Say, 1817. 



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



Widely umbilicated, closely plicate, brownish ; whorls 6?-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. PI. 26, figs. 27-31 ; PI. 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. 



