SMITHSONIAN INSTITUTION. 



UNITED STATES NATIONAL MUSEUM. 



SPECIAL BULLETIN. 



AMEEICAN HTDROIDS 



FA-RT III. 



THE CAMPANULAKID^ AND THE 

 BONNEVIELLIDJE, 



WITH TWENTY-SEVEN PLATES. 



CHARLES CLEVELAND NUTTING, 



PROFESSOR OF ZOOLOaY, STATE UNIVERSITY OF IOWA. 



WASHINGTON: 



GOVERNMENT PRINTING OPPICE. 



1915 



