SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 100 



VOLUME 6 



CONTRIBUTIONS TO THE BIOLOGY OF THE 



PHILIPPINE ARCHIPELAGO AND 



ADJACENT REGIONS 



PAPERS ON PHILIPPINE DIATOMS, 



ANNELIDS, HYDROIDS, ECHINOIDS, 



AND MOLLUSKS 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1939 



