HELIX-CATHAICA. 213 



2, f. 1, 2. #. riehthofeni MTS., Mai. Bl. xxi, p. 68 (1873) ; Novit. 

 Conch, iv, p. 150, t. 134, f. 11-14; Sitzungs-Ber. Ges. Nat. Fr. 

 Berl. Jan. 1875, p. 3. PFR., Monogr. vii, p. 276, 583. 



The transversely-inflated contour is characteristic. Figures 21- 

 23 represent the synonymous H. riehthofeni Mts. 



H. CONFUCII Hilber. PI. 29, figs. 98, 99, 100. 



Shell rather narrowly, very deeply umbilicated (the umbilicus 

 slightly covered), depressed-globose, not keeled even when young. 

 Upper three whorls and umbilicus dark horn-brown colored, the 

 following whorls, as far as the base of the last, brownish, with 

 streaks of the color of the earlier whorls ; the same color forming a 

 band on the last whorl. Base whitish with brown streaks. Surface 

 having rather coarse ribs, visible to the naked eye, becoming weaker 

 toward the umbilicus. The spire is more or less raised; the 5J 

 whorls convex, sutures deep. Aperture oval, the peristome very 

 much thickened within, and reflexed at the columellar margin only, 

 so that the umbilicus is partly covered when viewed directly from 

 below ; parietal callus quite thin. 



Alt. 11-13, diam. 16-18 mill. (Hilb.) 



Provinces Gansu and Shensi, China. 



H. confucii HILB., /. c. 1882, p. 337, t. 2, f. 3-5. 



Distinguished by the coarse rib-striation and larger size from the 

 last species. 



(Sinistral species.) 



H. CHRISTINA H. Adams. PL 57, figs. 15, 16, 17. 



Shell sinistral, openly, perspectively umbilicated (the umbilicus con- 

 tained about three and a half times in the diameter of the shell) ; 

 depressed, discoidal, rather thin. Surface marked with fine growth 

 lines. Whitish, distinctly radially banded and more or less suifused 

 with brown above, having a narrow white band above and a wide 

 brown band below the peripheral keel, the base having several 

 obscure spiral bands, and radiately streaked with corneous- brown ; 

 interior of umbilicus brown. 



Spire almost flat ; whorls 5f ; apex brown, a trifle projecting, the 

 inner whorls rather flat; last H whorls decidedly convex and swollen 

 above, obtusely angular above the middle, the angle disappearing on 

 the latter part of the body-ivhorl; deflexed a little at the aperture. 



