ADVERTISEMENT. 



The present publication (Bulletin No. 37) is the forty-eighth 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 in charge by 

 the act of Congress of August 10, 1846. 



The publications of the National Museum consist of two series — the 

 Bulletins, of which this is No. 37, in continuous series, and the Proceed- 

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



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

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

 distributed to libraries promi)tly after its publication. 



Full lists of the 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 Museum are referred to the Committee on Publications, 

 consisting of the following members : T. H. Bean, A. Howard Clark 

 (editor), Otis T. Mason, John Murdoch, Leonhard Stejneger, Frederick 

 W, True, and Lester F. Ward. 



S. P. Langlby, 

 Secretary of the Smithsonian Institution. 



Washington, May 27, 18S9. 



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