BARTSCH: PHILIPPINE LANDSHELLS 653 



Strong spiral lirations on the next to the 



last whorl 6 pusilla 



Strong spiral lirations on the next to the last 

 whorl not 6. 

 Strong spiral lirations on the next to the 



last whorl 12 bonahaoana 



Greater diameter less than 9 mm. 



Spiral opercular lamella remarkably broad. bulusana 

 Spiral opercular lamella not remarkably broad. 

 Spiral lirations at the end of the second 

 whorl 8. 

 Spiral lirations strong on the first half of 



the last turn halanacana 



Spiral lirations feeble on the first half of 



the last turn iicaoensis 



Spiral lirations at the end of the second 

 turn not 8. 

 Spiral lirations at the end of the second 



turn 7 masbatensis 



Spiral lirations at the end of the second 

 turn not 7. 

 Spiral lirations at the end of the second 



turn 5 marindviquensis 



Operculum with the inner edge of the whorls not uptui^ned to 



form a thickened lamella. PLATYRAPHELLA 



Umbilicus almost closed. 



Strong riblike axial sculpture distantly spaced .... malibagoana 



Strong riblike axial sculpture not distantly spaced globula 



Umbilicus not almost closed. 

 Umbilicus narrow. 



Greater diameter more than 12 mm. 



Axial sculpture of base very rough plebeia 



Axial sculpture of base not very rough camarinana 



Greater diameter less than 10 mm cmzana 



Umbilicus broad. . 

 vSpire well elevated. 



Greater diameter more than 12 mm expansilabris 



Greater diameter less than 1 1 mm. 



Peristome broadly expanded calamianensis 



Peristome not broadly expanded bakuitana 



Spire depressed substriata 



