HELIX. 215 



neled; whorls 6, slowly increasing, the last angulated, descending 

 in front, base convex, subcompressed around the umbilicus; lip 

 simple, shortly reflected below. Diam. 29 mill. 



Torres Sts., Australia. 



H. PLECTILIS, Benson. PI. 49, figs. 18, 17. 



Subcovered perforate, brownish Avhite, opaque, with strong angul- 

 arly flexuous, oblique rugosities, becoming smoother below ; whorls 

 4, the last deflected in front, periphery obtusely angulated ; aperture 

 subcircular, peristome expanded, a little reflected, margins approach- 

 ing and connected by a parietal callus, columellar lip expanded, 

 more or less covering the umbilicus. Diam. 14'5 mill. 



Shark's Bay, W. Australia. 

 H. paleata, Reeve (fig. 17), is a synonym. 



H. TORULUS, Fer. 



Subperforate, globular, white, smooth, with a chestnut band; 

 whorls 6, convex, narrow, base inflated; aperture rather small, 

 rounded-lunar, lip simple, white, upper margin subexpanded, basal 

 dilated, reflected; partly covering the umbilicus. 



Diam. 15 mill. 



Australia. 

 H. DURALENSIS, Cox. PL 50, figs. 20, 21. 



Umbilicated, a little solid, rudely costate, especially at the suture, 

 and very minutely granulated, dark chestnut color or yellowish, 

 paler below; whorls 5, the last carinated, a little descending in 

 front; aperture pale rosy, lip slightly reflected. Diam. 20 mill. 



Dural, New South Wales. 



H. DUNKIENSIS, Forbes. PI. 50, figs. 23, 22, 24. 



Moderately umbilicated, striated and minutely granulated, light 

 fulvous; whorls 5J, slowly increasing, rugulose at the suture, last 

 whorl not descending, periphery subangulated, base inflated, sub- 

 compressed round the umbilicus ; lip white, shortly expanded. 



Diam. 25 mill. 



Dunk Isl. N. Australia. 



Forbes' figure (fig. 22) represents a young shell. 



H. PRUNUM, Fer. PL 50, figs. 25, 26. 



Umbilicated, fulvous or chestnut color, sometimes with a dark 

 chestnut peripheral line, obliquely striate and obsoletely granular; 



