ADVERTISEMENT. 



The present publication (Bulletin No. 30) is the forty seveuth of a 

 series of papers luteuded to illustrate tlie collections belonging to the 

 United States, and constituting tbe National IMuseuni, of which the 

 Smithsonian Institution was placed in charge by tbe act of Congress 

 of August 10. 1846. 



The Dublications of the National Museum consist of two series — tbe 

 B illetins, of which this is No. 36 in continuous series, and the Proceed- 

 ings, of which the eleventh volume is now in press. 



The volumes of Proceedings are printed, signature by signature, each 

 issue having its own date, and a small edition of each signature is dis- 

 tributed to libraries promptly after its publication. 



Full lists of tlie publications of the Museum may be found in the cur- 

 rent catalogues of the publications of the Smithsonian Institution. 



Papers intended for publication in the Proceedings and Bulletins of 

 the National " ' seum are referred to the Committee on Publications, con- 

 sisting of the lollowing members: T. H. Bean, A. Howard Clark (editor), 

 OtisT. Mason, John Murdoch, Leonhard Stejueger, Frederick W. True, 

 and Lester F. Ward. 



S. P. Langley, 



Secretary of the Smithsonian Institution, 

 Washington, February 25, 1889. 



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