THE INTERNATIONAL SCIENTIPIC SERIES. 



JELLY-FISH, STAR-FISH 

 AND SEA-URCHINS 



BEING 



A RESEARCH ON PRIMITIVE NERVOUS SYSTEMS 



BY 



G. J. ROMANES, 31. A., LL. D., F. R. S. 



ZOOLOGICAL SECEETAEY OF THK LISXEAX SOCIETT 



NEW YORK: 

 D. APPLETOX AND COMPANY, 



1, 3, AND 5 BO^'D STREET. 



1893. 



