U. S. NATIONAL MUSEUM 



BULLETIN 100, VOL. 6, PART I PL. 5 

 1. 





2. 





4. 



4\\li((!il#A 



> 5. 



_ mT r^ ' ' l,! ' l^iMl'liilflllliHBliaBtti 



ft — -**** ± 6 



Diatoms of the Philippine Islands 



For explanation of plate see page 176 



