A D V B K T 1 S E M E N T 



This work is ilic twenty -third of a series of papers intended to 

 illustrate the eollectious of natural history and ethnology belonging to 

 tiie United States, and coustitntiug' the National Museum, of which the 

 Smithsonian Institution was placed in charge by tlie act of Congress 

 of August 10, 184(). 



It has been prei)are<l at the request of the Institution, and printed by 

 authority of the honorable Secretary of the Interior. 



SPENOEJJ F. BAIRD, 

 Secretary of the i^mit^imuMn Institution. 



SMI T USON 1 AA 1 N STITUTION . 



Wattliinqton, February 1, 188o. 



