ADYEETISEMENT, 



This work is the fifteeenth of a series of papers inteudecl to illustrate 

 the collections of Natural History ami 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 i)riuted by 

 authority of the honorable Secretary of the Interior. 



SPENCER F. BATKD, 

 Secretary of the Sinithsonian Institution. 



Smithsoniaji Institution, 



Washington, April 15, 1879. 



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