652 bartsch: Philippine; IvAndshblls 



Incremental sculpture consisting of rough riblike 

 elements only. 

 Greater diameter more than 13 mm. 



Inner edge of opercular turns decidedly free, 



forming a strong lamella cehuensis 



Inner edge of opercular turns not decidedly 



free nor forming a strong lamella . . . anacampta 



Greater diameter less than 1 1 mm samarensis 



Incremental sculpture not very strong balukensis 



Last whorl not disjunct at the aperture in adult shells. 

 Last whorl strongly spirally lirate. 



Spiral lirations absent on the anterior third of the 

 whorls. 



Greater diameter more than 13 mm mucronata 



Greater diameter less than 13 mm. 

 Greater diameter more than 10 mm. 



Shell finely spirally lirate cagayanica 



Shell coarsely spirally lirate vincentensis 



Greater diameter less than 8 mm palauiensis 



Spiral lirations not absent on the anterior third of the whorl. 

 Shell planorboid. 



Spiral sculpture present at the summit of the whorls. 

 Nepionic whorls dark. 



Greater diameter more than 10 mm lateplicata 



Greater diameter less than 9 mm stenostoma 



Nepionic whorls light sibuyanensis 



Spiral sculpture absent at the summit of the whorls . 



lubangensis 



Shell not planorboid. 



Spiral lirations feeble on the upper surface of the last 

 fourth turn. 

 Spire depressed. 



Spiral lirations on the base of last whorl strong 



jordana 



Spiral lirations on the base of last whorl feeble 



toppingi 



Spire not depressed but rather elevated. 



Axial sculpture very coarse sarangamensis 



Axial sculpture not coarse pahnasensis 



Spiral lirations not feeble on the upper surface of 

 the last fourth turn. 

 Spiral lirations obsolete on the upper surface of the 

 last fourth turn. 

 Greater diameter more than 10 mm. 



Strong spiral lirations on the next to the last 



whorl 5 paghilaoensis 



Strong spiral lirations on the next to the last 

 whorl not 5. 



