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ADVERTISEMENT. 
This work is the sixth of a series of papers intended to illustrate the 
collections of Natural History and Ethnology belonging to the United 
States and constituting the National Museum, of which the Smithsonian 
Institution was placed in charge by the act of Congress of August 10, 
1846. 
It has been prepared at the request of the Institution, and printed by 
authority of the honorable Secretary of the Interior. 
JOSEPH HENRY, 
Secretary Smithsonian Institution. 
SMITHSONIAN INSTITUTION, 
Washington, February, 1876. 
