SMITHSONIAN INSTITUTION 

 UNITED STATES NATIONAL MUSEUM 





BULLETIN 



OF THE 



UNITED STATES NATIONAL MUSEUM 



No. 54 



MONOGRAPH ON THE 

 ISOPODS OF NORTH AMERICA 



BY 



HARRIET RICHARDSON 



COLLABORATOR, DIVISION OF MARINE INVERTEBRATES 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1905 



