HYPSELOSTOMA. 185 



equal teeth, opposed in form of a cross. Diam. 2.3, alt. 2 mm. 

 (Mlldff.). 



Philippines: a high mountain of Sibuyan (C. Roebelen). 



Hypselostoma sibuyanicum MLLDFF., Nachrbl. d. Mai. Ges., 

 vol. 28, Feb. 1896, p. 11. 



8. HYPSELOSTOMA POLYODON Moellendorff . 



Shell narrowly perforate, turbinate, thin, pellucid, deli- 

 cately striatulate, opaque, buff-corneous. Spire rather ele- 

 vated, the sides concave, apex oblique, obtuse. Whorls 5, 

 convex, separated by a deeply impressed, almost channeled 

 suture, the last whorl obtusely carinate at the periphery, im- 

 pressed above the carina, subsulcate, base flat; in front it is 

 shortly free and built forward, moderately ascending, the 

 carina suddenly disappearing at the beginning of the ascent. 

 Aperture strongly inclined backward, rounded-rhomboid. 

 Peristome thin, narrowly expanded throughout. Parietal 

 lamella very strong, nearly % the height of the aperture, 

 flexuous ; on the right margin a rather long lamella approach- 

 ing the former ; columellar" short but rather strong ; three 

 rather strong basal teeth. Diam. 2.66, alt. 2 mm. (Mlldff.). 



Philippines: Tablas; taken by a native collector. 



Hypselostoma polyodon MLLDFF., Nachrichtsbl. d. Mai. Ges., 

 vol. 28, Feb. 1896, p. 12. 



9. HYPSELOSTOMA QUADBASI Moellendorff. PL 32, fig. 5. 

 Shell most narrowly perforate, irregularly pyramidal, thin, 



somewhat pellucid, minutely striatulate, opaque, brown. 

 Spire elevated conic, the apex obtuse. Whorls 5, angularly 

 convex, separated by a rather deep suture, the last shortly 

 free and built forward, a little ascending. Aperture vertical, 

 rounded-tetragonal. Peristome shortly expanded, thin. Pari- 

 etal lamella and columellar moderate, two teeth in the throat 

 opposite them in form of a cross. Diam. 2.5, alt. 2.5 mm. 

 (Mlldff.). 



Philippines: Sierra Bullones, Bohol. 



Hypselostoma quadrasi MLLDFF., Nachrbl. d. Malak. Ges., 

 vol. 28, Aug. 1896, p. 88. 



