SYRACUSE 



SWACUSE, N 

 SMITHSONIAN INSTITl'TION. 



UNITED STATES NATIONAL MUSEUM. 



SPECIAL nrLLKTIN. 



AMERICAN HYDHOIDS. 



ii. 



THE SERTULAR] IKE, 



WITH FORTY-ONE PLATES. 



BY 



CHARLES CLEVELAND NUTTING, 



PROFESSOR OF ZOOLOGY, UNIVERSITY OK IOWA. 



WASHINGTON: 



OOVI I: \ M I. N T I'IMNTIM; Ul'FICE. 



1904, 



