HYPSELOSTOMA. 185 



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

 (Mlldff.). 



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



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

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



8. HYPSELOSTOMA POLYODON Moelleudorff. 



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 QUADRAS: 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. 



