HELIX-CATHAICA. 209 



Alt. 13, greater diam. 26, lesser 21 mill, (abnormally large spe- 

 cimen.) 



Lan-tshu-fu, valley of the Hoangho, Prov. Kansu, and at Yerkalo, 

 on the upper Mekong. 



Helix buddce HILB., Sitz.-Ber. k. Akad. Wiss. Wien. Ixxxvi, 

 p. 339, t. 2, f. 8, 9. 



Allied to the three following species. 



H. PRZEWALSKII Martens. PI. 48, figs. 16-18 ; pi. 55, figs. 20, 21, 

 22. 



Shell depressed, openly umbilicated, irregularly striatulate and 

 indistinctly spirally lineate, brownish-gray, variegated with streaks 

 and spots of whitish. Spire hardly projecting ; whorls 5J, separated 

 by a rather deep suture, the last whorl a little more convex beneath, 

 slightly subangular at the periphery, rounded at the aperture, and 

 having a yellowish-white thickened streak there (Mts.~) 



Peristome strongly reflexed, the terminations joined by a thin 

 callus (Hilb.} 



Alt. 11, greater diam. 19, lesser 18 mill. (Ms.) 



Alt. 13, greater, diam. 21, lesser, 17 mill. (Hilb.') 



Provinces Gansu, Sytshuan and Yunnan, China. 



Helix przewalskii MARTENS, Centralas. Moll., p. 12, t. 2. f. 9, 

 (May 25, 1882). IT. mencii HILBER, Sitz.-Ber., p. 341, t. 3, f. 1-3 



(Nov. 1882). 



.Allied to H. buddce but is less depressed, with less acute keel. 

 Von Martens described an immature shell (pi. 48, figs. 16-18). 

 The mature form has been described by Hilber as H. mencii (pi. 55, 

 figs. 20-22). A variety described and figured by Hilber differs in 

 having the keel only feebly indicated (pi. 47, figs. 82, 83.) 



H. GREDLERI Hilber. PI. 29, figs. 95, 96, 97. 



Shell rather widely umbilicated, depressed ; whitish (except the 

 first whorl which is brown), having two sharply defined brown 

 bands. Sculpture consists of distinct riblets, cut by spiral furrows. 

 Spire very low, the apex slightly raised ; whorls 5$, slightly convex, 

 separated by deep sutures. Aperture oval, oblique, the upper mar- 

 gin deflexed ; peristome whitish, strongly reflexed, having no inner 

 lip ; margins of the lip sharp, connected by a thin callus. 



Alt. 10, greater diam. 18, lesser 14 mill. (Hilb.'} 

 14 



