HYPSELOSTOMA. 177 



&. Alt. 2, diam. 5 mm. ; white. Tonkin. 



H. mirdbile, no. 2. 

 & 1 . Diani. 4 to 4.5 mm. 



c. 5 to 7 teeth, the upper palatal bilobed; spiral 

 striation very faint or obsolete on last whorl. 

 Burma, etc. H. tubiferum, no. 1. 



c 1 . 4 teeth, the upper palatal simple; spirally 

 striate. Philippines. H. roebeleni, no. 11. 



a 1 . Spire conic or pyramidal; umbilicus narrow except in the 

 last half- whorl; aperture subvertical or moderately in- 

 clined upward. 



&. Aperture without teeth; diam. 3.25 mm., equal to or 

 exceeding the alt. Calamianes, Philippines. 



H. edentulum, no. 12. 

 6 1 . Aperture having teeth. 



c. Alt. 3.8 to 4.4 mm., exceeding the diam. ; last 



whorl scarcely ascending, shortly free, densely 



striate spirally and not conspicuously angular. 



Aiinam. H. annamiticum, no. 3. 



c 1 . Smaller, more delicate insular species. 



d. Alt. 1.75, diam. 2.3 mm. ; 6 teeth. Loo- 

 choo Is. H. insularum, no. 5. 



d l . Philippine species. 



e. 6 teeth, the parietal very strong; 

 alt. 2, diam. 2.66 mm. Tablas. 



H. polyodon, no. 8. 

 e 1 . 4 or 5 teeth, there being no basal 

 plica. 



/. Neck long, but little ascend- 

 ing; last whorl strongly 

 earinate and spirally striate. 

 Luzon. H. luzonicum, no. 6. 

 /*. Neck rather short, the last 

 whorl angular, not spirally 

 striate ; alt. 2.5, diam. 2.2 to 

 2.5 mm. Bohol. 



H. quadrasi, no. 9. 



