118 HELIX-EUHADRA. 



narrow, increasing slowly ; and the aperture is not so oblique as in 

 most helices. The species all have a narrow dark band just on and 

 above the periphery. They range from Central China to Formosa 

 and the Liu-kiu Islands. 



H. SUCCINCTA H. Adams. PL 25, figs. 94, 95. 



Shell narrowly, profoundly umbilicated, depressed, convex below, 

 the spire low-conical, periphery rather sharply keeled ; it is rather 

 thin but solid, of a light brownish or pale yellow color, with a 

 narrow distinct reddish peripheral girdle visible on the whorls of 

 the spire at the suture ; this girdle is bordered both above and below 

 with whitish ; the suture also is bordered below with whitish. 

 Surface slightly shining, obliquely finely striate, encircled by numer- 

 our fine irregular spiral lines on the base, very finely obliquely but 

 obsoletely malleated on the upper surface. Spire conic ; apex shin- 

 ing, minute; whorls 5, a little convex, slowly widening, the last 

 keeled, not descending in front. Aperture a little oblique, broad- 

 lunate ; peristome white, narrowly expanded, subreflexed and flat- 

 tened, dilated half over the umbilicus, marked by the termination 

 of the band on the outer lip. 



Alt. 13, greater diam. 19J, lesser 18 mill. 



Alt. 16, greater diam. 24, lesser 21 J mill. 



Alt. 18, greater diam. 27, lesser 23 mill. 



Formosa. 



H. succincta H. AD. P. Z. S. 1866, p. 316, t. 33, f. 4, 4a. PFR. 

 Monog. Hel. Viv. vii, p. 388. MOLLENDORFF, Jahrb. D. M. Ges. 

 1884, p. 383, t, 9, f. 7, 8. 



This species is abundant at Da-gou (Takow or Takao), Formosa. 

 It varies considerably in size. 



H. FRIESIANA Mollendorff. PI. 25, figs. 96, 97. 



Shell narrowly umbilicated, globose-conoid, obliquely striatulate 

 and decussated by rough spiral lines, brown, marked at the periph- 

 ery with a blackish-brown very narrow band. Spire conoid, apex 

 rather acute ; whorls 6, subplane, separated by a scarcely impressed 

 suture, the last whorl acutely carinated, scarcely descending in front, 

 compressed beneath, flattened behind the aperture on the base. 

 Aperture oblique, lunate-elliptical ; peristome expanded, slightly re- 

 flexed, margins joined by a very thin callus, the basal margin nearly 



