BARTSCH: PHILIPPINE LANDSHEJLLS 65 1 



Strong spiral lirations at the end of the second whorl 

 not 8. 

 Strong spiral lirations at the end of the second 



whorl 10 busuangensis 



Strong spiral lirations at the end of the second 

 whorl not 10. 

 Strong spiral lirations at the end of the second 



whorl 12 balabakensis 



Greater diameter less than 6 mm. 



Strong spiral lirations at the end of the second 



whorl 12 ulugana 



Strong spiral lirations at the end of the second 

 whorl not 12. 

 Strong spiral lirations at the end of the second whorl 



9- 



Greater diameter more than 5 mm leytensis 



Greater diameter less than 5 mm guimarasensis 



Spiral lirations not strongly developed on the last whorl. 

 Spiral lirations only feebly developed on the last whorl. 

 Strong spiral lirations at the end of the second whorl 



16 gradata 



Strong spiral lirations at the end of the second whorl 

 not 16. 

 Strong spiral lirations at the end of the second 



whorl 12 toledoana 



Strong spiral lirations at the end of the second whorl 

 not 12. 

 Strong spiral lirations at the end of the second 



whorl 8 businensis 



Strong spiral lirations at the end of the second 

 whorl not 8. 

 Strong spiral lirations at the end of the second 



whorl 7 negrosensis 



Strong spiral lirations at the end of the second 

 whorl not 7. 

 Strong spiral lirations at the end of the second 

 whorl 6. 

 Spiral lirations on the umbilical wall of the 



last whorl well marked mindanensis 



Spiral lirations on the umbilical wall of the 



last whorl obsolete buriasensis 



Spiral lirations not feebly developed on the last whorl. 

 Spiral lirations absent on the last whorl. 

 Incremental sculpture very strong. 



Incremental sculpture consisting of rough riblike 

 elements and fine threads between them . . surigaoana 



