180 Proceedings of the Biological Society of Washington. 



Cochlostyla palavanensis graellsi Hidalgo. 



1886 Cochlostyla graellsi, Journ. de Conch., vol. 35, p. 155, pi. 8, f. 5. 



This is the large Cochlostyla on Balabac Island, a very strongly marked 

 race of palavanensis usually showing a dark sutural band. 



Twenty-five specimens taken at random yield the following measure- 

 ments : 



Cochlostyla palavanensis mantangulensis, new subspecies. 



On the island of Mantangule we have a small race of this species in which 

 we may have the alternate light and dark axial streaking, or sometimes the 

 light gray epidermis almost completely envelops the last whorl. Ten 

 specimens yield the following measurements: 



iType. 



