208 HELIX-CATHAICA. 



(1882). Ancey, II Nat. Sicil. 1883, p. 8.H. (Cathaica) i 

 MLLDFF., Jahrb. 1884, p. 343. 



H. BREVISPIRA H. Adams. PI. 47, fig. 75. 



Shell narrowly umbilicated, depressed-orbiculate, very thin, fra- 

 gile, tawny horn-colored, pellucid, obliquely striated ; spire short, 

 the apex obtuse, suture impressed, whorls 5, nearly flat, the last not 

 descending in front, carinated, swollen beneath ; aperture lunar, the 

 right and basal margins slightly expanded, columellar margin 

 dilated, reflexed, half covering the umbilicus. 



Alt. 11, greater diam. 17, lesser 15 mill. (Ad.) 



Ichang gorge of the Yangtse River, Prov. Sytshaun, China. 



H. brevispira H. AD., P. Z. S. 1870, p. 377, t. 27, f. 6. PFR., 

 Monogr. vii, p. 458. H. ( Cathaica) brevispira MLLDFF., Jahrb. 1884, 

 p. 343. 



H. THIBETICA Deshayes. PI. 47, figs. 84, 85, 86. 



Shell depressed, discoidal, thin, fragile, dirty gray-brown ; spire 

 flattened, a little projecting at the apex. Whorls 5, slowly widen- 

 ing, separated by a deep suture ; the first whorl smooth, the rest 

 deeply and irregularly plicate, the last whorl having a prominent 

 crenulated angle at the periphery, which is above the middle of 

 the whorl ; base plicate, widely and deeply umbilicated ; aperture 

 thin, hardly oblique, whitish, lunate-subcircular, the margins dis- 

 connected, slightly reflexed. 



Alt. 9, greater diam. 19, lesser 16 mill. (DA.) 



Muping, Prov. Sytshuan, China. 



H. thibetica DH., Nouv. Arch, du Mus. vi, p. 21, (1870) ; ix, t. 2, 

 f. 8, 9. PFR. Monogr. vii, p. 457 MTS. Centralas. Moll. p. 20, 

 1882. H. (Cathaica) tibetica MLLDFF., Jahrb. 1884, p. 343. 



H. BUDDIE Hilber. PL 29, figs. 2-5. 



Shell rather broadly and deeply umbilicated, depressed, ground- 

 color brownish, having bluish or white streaks interrupted by two 

 brown bands. Between the raised growth-strise and over them on 

 the last whorl there are fine, close spiral impressed lines. 

 Spire very low, the apex light brown, moderately convex, whorls 6, 

 separated by deep sutures, the last whorl somewhat deflexed in front 

 strongly convex beneath, but slightly so above. The acute keel has 

 nearly vanished at the aperture, which is elliptical, oblique ; the 

 peristome reflexed, whitish, parietal callus very thin. 



Alt. 11, greater diam. 21, lesser 18 mill. 



