ADVERTISEMENT. 



Tliis«woik is the twelfth 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 JSmithsouiaa 

 Institution was placed in charge by the act of Congress of August 10, 

 184G. 



It has been prepared at the request of the Institution, ami iniiited by 

 authority of the liouorable Secretary of the Interior. 



JOSEPH HENRY^ 

 Secretary oj the Smithsonian In.stKution. 

 Smithsonian Institution, 



Washington, May, 1878. 



2 



