184 HYPSELOSTOMA. 



between them in most specimens from the type locality which 

 I have seen, but it is sometimes absent. There is no basal fold. 

 A sinulus is indistinctly defined by a prominence or boss on 

 the inner margin of the lip. The peristome is very thin 

 throughout. The original figures, copied in figs. 7, 8, are 

 somewhat diagrammatic, in Dr. Boettger's usual manner. 



6a. H. I. major Mlldff. PL 32, fig. 10. 



Differs from the type by the larger, more solid shell, more 

 convex, less angular whorls, the last one not or but slightly 

 sulcate spirally ; peristome more expanded, somewhat labiate, 

 and having a minute accessory denticle between the parietal 

 and columellar lamellaB. Alt. 2%, width 3, aperture alt. and 

 width iy 8 mm. (Mlldff.). 



High mountains of Morong district, Luzon. 



66. H. I imbricata Mlldff. PI. 32, figs. 11, 13. 



Differs by the slightly smaller, more slender shell, the whorls 

 being more distinctly angulate-carinate, the last having the 

 spiral sulcus more deeply excavated, aperture smaller, peri- 

 stome less expanded; generally 3 small, acute palatal teeth. 

 Alt. 1%, width 2%, alt. and width of aperture % mm. 

 (Mlldff.). 



Near the town of Medellin, northern Cebu. Fig. 13 is from 

 a specimen from the Quadras collection. 



H. I. lubanicum Mlldff. is mentioned in the Verzeichniss, in 

 Abhandl. Naturforsch. Ges. Gorlitz, vol. 22, 1898, p. 126, from 

 Luban. I have not found a description. 



7. HYPSELOSTOMA SIBUYANICUM Moellendorff. 



Shell rimate, thin, irregularly turrited-conie, very delicately 

 striate, opaque, pale corneous-brown. Spire turrited-conic, 

 with somewhat glossy, oblique apex. "Whorls 5, convex, sep- 

 arated by a strongly impressed suture, the last whorl rather 

 flat, obtusely carinate below the middle, slightly guttered 

 above the carina, strongly ascending in front, very shortly 

 free and built forward. Aperture inclined backward, 

 rounded-rhomboid; peristome simple, thin, much expanded. 

 Parietal lamella strong, much elevated, three rather long, sub- 



