

' 





SMITHSONIAN INSTITl TIOX. 

 UNITED STATES NATIONAL MUSEUM. 



SPECIE L BULLETIN. 



AMERICAN HYDIU)ID 



!PA I IT I I . 



THE SEKTULAEID^E, 



WITH r 



I'LATES. 



BY 



CHARLES CLEVEI tj NUTTING, 



PROCESSOR OF ZOOLOGY, UNIVERSITY OF IOWA. 



WASHINGTON: 



OOVKKNMKXT I 1 I: I ICE. 



1904. 



