ADVERTISEMENT. 



This work (Biilletiu Ko. 38) is tbe fifty-first of a series of papers in- 

 teuded to illustrate tbe coUectioDS of natural history aud etlinology 

 belougiug 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 l^ational Museum consist of two series — the 

 Bulletins, of which this is No. 38, in continuous series, and the Pro- 

 ceediugs, of which the thirteenth volume is now in press. A small edi- 

 tion of each paper in the Proceedings is distributed in pamphlet form 

 to specialists in advance of the publication of the bound volume. 



From time to time the publications of the Museum which have been 

 issued separately are combined and reissued as volumes of the Miscel- 

 laneous Collections. These are struck off from the stereotype plates 

 from which the first edition was printed, and in this form are dis- 

 tributed by the Smithsonian Institution to libraries and scientific socie- 

 ties throughout the the world. Volume 13 of these collections includes 

 Bulletins 1 to 10, inclusive ; volume 19, volumes 1 and 2 of the Proceed- 

 ings; volume 22, volumes 3 and 4 of the Proceedings ; and volume 23, 

 Bulletins 11 to 15, inclusive. 



Full lists of the publications of the Museum may be found in the 

 current 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. Langley, 



Secretary of the Smithsoyiian Institution. 

 Washington, June 1, 1800. 



u 



