SMITHSONIAN MISCELLANEOUS COLLECTIONS 

 VOLUME 111, NUMBER 8 



SOME STAGES IN THE EVOLUTION OF 



THE NERVOUS SYSTEM AND THE 



FORE-GUT OF THE POLYCHAET 



BY 



FRANK RAW 



University of Birmingham, England 



(Publication 3983) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



AUGUST 4, 1949 



