HELIX. 207 



base convex; aperture reddish, with a whitish margin, scarcely 

 expanded or thickened within. Diam. 15 mill. 



Hong Kong, China. 

 This is also suspected to be a variety of H. similaris. 



H. STRIATISSIMA, Desh. PI. 47, figs. 42, 43, 



Narrowly perforate, thin, fragile, pellucid, yellowish, minutely 

 plicate, crossed by microscopic spiral lines; whorls 5fc, the last 

 much larger, very obtusely angulated on the periphery ; lip thin, a 

 little reflected. Diam, 15 mill. 



Hong Kong, China. 

 H. NUCLEUS, Desh. PI. 47, fig. 44. 



Narrowly umbilicated, corneous, pellucid, yellowish, irregularly 

 striate, suture well-impressed ; whorls 6, convex, narrow, the last a 

 little depressed in front ; lip thickened, reflected, white. 



Diam. 18 mill. 



Shanghai, China. 



Perhaps a variety of H. similaris, Fer. 



H. ARUNDINETORUM, Heutfe. PL 47, figs. 45, 46. 



Narrowly umbilicated, fragile, pellucid, fulvous, rarely with a 

 light rufous peripheral band, minutely spirally striate; whorls 5, 

 the last rapidly enlarging, not descending, periphery obsoletely 

 angulated ; lip. narrow, scarcely reflected, reddish or white. 



Diam. 13 mill. 



River Yangtze, China. 

 H. GBAMINUM, Heude. PL 47, fig. 47. 



Narrowly umbilicated, corneous or flavous, sometimes with a 

 chestnut band, spirally minutely or strongly striate ; whorls 6, 

 convex, slowly increasing, the last obsoletely angulated ; aperture 

 white, lip scarcely thickened, slightly reflected. Diam. 18 mill. 



River Yangtze, China. 



H. STRAMINEA, Heude. PL 47, figs. 48, 49. 



Narrowly umbilicated, thin, pellucid, whitish or yellowish, some- 

 times with a chestnut band, minutely spirally striate; whorls 5J, 

 convex, with deep suture, last whorl laterally convex, flattened 

 below, descending in front; peristome subreflected.. 



Diam. 21 mill. 



Yangtze River, China. 



H. CREMATA, Heude. PL 47, figs. 52, 53. 



Narrowly umbilicated, yellowish, with a narrow chestnut band, 

 very minutely spirally striate, suture superficial ; whorls 4-5, convex, 



