158 HELIX-CANDIDULA. 



two small denticles in front of the parietal partition, and the even, 

 instead of scalloped, edge of the latter. The specimens before me 

 were collected by the Abbe A. Vathelet. 



P. PHLYARIA Mabille. PI. 43, figs. 40, 41, 42. 



Shell openly umbilicated, depressed-discoidal, thin, a little solid, 

 scarcely shining, dull whitish under a deciduous, grayish, hairy cuti- 

 cle, arcuately striated and seen under a lens to be covered with 

 imbricating lamellae. Spire flat, apex shining, smooth, corneous. 

 Whorls 7i, narrow, convex, rather rapidly and regularly increas- 

 ing, separated by a deeply impressed suture. The last whorl large, 

 but little wider than the preceding whorl if viewed from above ; 

 laterally compressed, obscurely angulated at the periphery, deeply 

 descending in front, tortuous, a little convex beneath. Aperture 

 half-round, toothed, the margins connected by a transverse parietal 

 lamina behind which a dentiform callus emerges ; peristome white, 

 thick, reflexed. Alt. 5, greater diam. 15, lesser 13 mill. 



Tonquin. 



Helix phlyaria MAB., Moll. Tonk. diagn., p. 6, May, 14, 1887; 

 Bull. Soc. Mai. Fr. 1887, p. 100, t. 2, f. 1, 2, 3. 



Unfigured species of Plectopylis. 



PLECTOPYLIS AZONA Gredler, Nachr.-bl. D. M. Ges. 1889, p. 155, 

 156. China. 



HELIX ESAU Gredler, Jahrb. D. M. Ges. xiv, 1887, p, 346. 

 Province Hupe, China. HELIX JACOB Gredler, 1. c., p. 347. Hupe. 

 HELIX PATUNGANA Gredler, 1. c. p. 348. Shi-shia-ho, southwest Hupe. 

 The systematic position of these small, toothless species is uncertain. 

 They group with kuangtungensis, squamulina, etc. ; and may belong 

 in the neighborhood of Plectotropis. 



HELIX VALLATA Heude, Journ. de Conch. 1889, p. 45. Tchen- 

 K'eou, China. See also Gredler, Nachr.-bl. D. M. Ges. 1889, 

 p. 202. 



Genus HELIX L. 



Subgenus XEROPHILA Held. 



Section Candidula Kobelt. 



H. HERIPENSIS Mabille. PI. 44, figs. 92, 93, 94. 



Shell depressed, openly umbilicated, the umbilicus narowing very 

 rapidly, its width contained about 5? times in the diameter of the 



