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 iu 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. 



