ADVERTISEMENT. 



This work is the fourth 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 jjrepared 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. 



