186 HYPSELOSTOMA. 



The last whorl has a rounded angle in front, but in the last 

 half this is pinched up into a rounded keel with a concavity 

 above it. The glossy apical whorl is set rather sparsely with 

 minute granules, and faint traces of spiral threads may usu- 

 ally be seen on the following whorl or two, the last whorl 

 being smooth, matt, with some wrinkles along growth-lines in 

 the umbilicus. The upper palatal plica descends a little in- 

 wardly. 



Alt. 2.4, diam. 2.3 mm. 



Alt. 2.5, diam. 2.2 mm. 



Related to luzonicum, but not so thin, smooth, the neck very 

 short. Figured from topotypes from the Quadras collection. 



10. HYPSELOSTOMA PUSILLUM Moellendorff. 



Shell rimate, turbinate, thin, finely striatulate, corneous, 

 the spire much elevated, gradate. Whorls 5%, angularly con- 

 vex, separated by a very deeply impressed suture, the last 

 whorl obtusely carinated at the periphery, planulate at base, 

 distorted and ascending, its last fourth free, built forward, 

 almost quadrangular behind the aperture. Aperture some- 

 what slanting backward; peristome simple, thin, shortly ex- 

 panded. Parietal lamella rather elevated, another smaller 

 one in the outer margin opposite and nearly touching the 

 former, and with it inclosing a circular sinulus; columellar 

 and palatal low and very deeply placed. Diam. 2, alt. 2 mm. 

 (Mttdff.). 



Philippines: Coron Island, Calamianes (C. Roebelen). 



Hypselostoma pusillum MLLDFF., Nachrbl. d. Mai. Ges., vol. 

 26, June 1894, p. 100. 



11. HYPSELOSTOMA ROEBELENI Moellendorff. PI. 31, figs. 8. 

 9,10. 



Shell moderately and perspectively umbilicate, depressed- 

 conoid very lightly radially striatulate, somewhat decussated 

 by spiral microscopic lines, corneous-brown. Spire gradate, 

 moderately elevated, the sides a little concave, apex somewhat 

 obtuse. Whorls 4%, convex, separated by a deep suture, the 

 last bent upward from the middle, then becoming free, and 



