194 HELIX-PLECTOTROPIS. 



little thickened, columellar margin subvertical, much prolonged tri- 

 angularly above. 



Alt. 9-1 (H, greater diam. 18-22, lesser 16-191 mill.; apert., alt. 

 7-8J, width 9J-10J mill. (S. & .) 



South Cape of Formosa. 



Helix (Pledotropis') lautsl, S. & B., Nachr.-bl. D. M. Ges., 1890, 

 p. 4, t. 1, f. 1. H. ( Pledotropis) shermani var. lautsi S. & B., I. c., 

 1891, p. 154. 



Compared with H. mellea Pfr., this species has more whorls and 

 more oblique aperture. It is more sharply keeled than H. macken- 

 sii Ad. & Rv., thinner shelled, flatter on the base, not swollen 

 around the umbilicus as in mackensii, and the umbilicus is narrower. 

 These characters also separate it from H. trichotropis and H. ger- 

 lachi, between which it stands somewhat intermediate. Fresh 

 examples will be found to have a fringe of hairs at the keel. 



Var. BRACHYLASIA Schmacker & Boettger. 



Shell higher, spire more conic, whorls spirally lineolate and 

 sparsely beset with extremely short hairs, the scars weak, at the 

 carina and in the umbilicus distinctly sculptured, as if subgranu- 

 lose. 



Alt. 7J-8J, diam. 13-15 mill. (S. & B., I c., p. 156). 



TaJcao. 



H. SQUARROSA Gould. PI. 53, figs. 66, 67. 



This species was briefly described by Gould from Oosima, Japan. 

 Schmacker has identified with it, I believe correctly, a form from 

 Nagasaki, which is here figured. See Nachr.-bl. d. d. Mai. Ges., 

 1890, p. 6, t. 1, f. 2. 



Unfigured species of Pledotropis. 



Troehomorpha fritzei Bttg., Nachr.-bl. d. d. Mai. Ges., 1892, p. 

 160. Kinmura, of Okinawa, middle Liukiu. Boettger is disposed 

 to group this and H. eathcartce in Trochomorpha, but they are more 

 likely to belong here, in the writer's opinion. 



If. ningpoensis Bttg. /. c. p. 161. Ningpo. 



H.pandynama J. Mabille, Bull. Soc. Philomath, de Paris, 1883- 

 84, p. 48. Thibet. Near Stoliczkana. 

 H. desgodinsi Bgt. I. c., p. 49. Thibet. 



