194 HELIX-PLECTOTROPIS. 



little thickened, columellar margin subvertical, much prolonged tri- 

 angularly above. 



Alt. 9-10 J, greater diam. 18-22, lesser 16-19 J mill.; apert., alt. 

 7-8 *, width 9 -10* mill. (S. & B.} 



South Cape of Formosa. 



Helix (Plectotropis'} lautsi, S. & B., Nachr.-bl. D. M. Ges., 1890, 

 p. 4, t. 1, f. 1. H. ( Plectotropis} 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. 7-8*, diam. 13-15 mill. (S. & B., 1. c., p. 156). 



Takao. 



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 Plectotropis. 



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

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

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

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



H. ningpoensis Bttg. 1. c. p. 161. Ningpo. 



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

 84, p. 48. Thibet. Near Stoliczkana. 

 H. desgodimi Bgt. 1. c., p. 49. Thibet. 



