58 



IIKLIX. 



Witli columellar plication. 



H. GONIOCIIILA, Pfr. PI. 11, figs. 51, 52. 



Moderately umbilicated, somewhat solid, lightly striulate and 

 granular, subdiaphanous, pale corneous; whorls 62, narrow, slightly 

 convex, the last riot descending, acutely cariuated, base more con- 

 vex ; peristome sublabiate, sulcate exteriorly, columella transversely 

 uniplicate. Diam. 13 mill. 



Siam,. 

 H. T'TYCHOSTYLA, Mart. PL 33, figs. 65-67. 



Moderately umbilicated, somewhat solid, striate, brownish ; whorls 

 (.j, slightly convex, slowly increasing, the last obtusely carinated, 

 base convex; peristome white, expanded, columellar margin al- 

 most perpendicular, transversely uniplicate. Diam. 14 mill. 



Siam. 

 II . STYLOPTYCTA, Pfr. PI. 11, figs. 49, 50. 



Widely umbilicated, rather solid, closely striulate, diaphanous, 

 greyish corneous ; whorls 6, moderately convex, the last obsoletely 

 angulated, not descending in front; peristome white-lipped, margins 

 approaching, joined by a callus, expanded above and below, colum- 

 ella transversely plicate. Diam. 9 mill. 



Siam. 



A var. DBPRESSIOR has been indicated. This species is the H. 

 ptychostyla of Pfr., not Martens; but is perhaps only a variety of 

 Martens' species. 



Subsection PSEUDIUKKI'S, Ancey. 1887. 



H. PLKCTOTROPIS, Martens. PL 12, figs. 8-5. 



Moderately umbilicated, strongly, distantly, obliquely ribbed, 

 whitish ; whorls 5i, flattened above, carinate, carina crenulated, 

 angulating the last whorl, slightly descending at the aperture, base 

 a little convex ; peristome expanded, margins approaching, con- 

 nected by a thin callus. Diam. 19 mill. 



Mis. Thianschan, Central Asia. 

 H. SCEPASMA, Pfr. PL 13, fig. ">:>. 



Moderately umbilicated, solid, opaque, white, rugulosely striate, 

 suture subimpressed ; whorls 7, scarcely convex, slowly increasing, 

 the last a little descending in front, periphery acutely carinated* 

 base turgid around the umbilicus; perisiome subthickened, angu- 

 larly reflected. Diam. 20 mill. 



Hab. unknown. 



