ADVERTISEMENT. 



This work (Bulletin :N^o. 28) is the thirty-eighth of a series of papers 

 intemled to illustrate the collections of natural history and ethnology 

 belonging to the United States, and constituting the I^ational Museum, 

 of which the Smithsonian Institution was placed in charge by the act of 

 Congress of August 10, 1840. 



It has been prepared at the request of the Institution, and printed 

 by authority of the honorable Secretary of the Interior. 



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

 Bulletins, of which this is No. 28, in continuous series, and the Proceed- 

 ings, of which the seventh 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. 



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

 issued separately are combined together, and issued as volumes of 

 the Miscellaneous Collections. These are struck off from the stereo- 

 type plates from which the first edition was printed, and in this form 

 are distributed by the Smithsonian Institution to libraries and scientific 

 societies throughout 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 cur- 

 rent catalogues of the publications of the Smithsonian Institution. 



SPENCER F. BAIRD, 

 Secretary of the Smitlisonian Institution. 



Smithsonian Institution, 



Washington, October 1, 1884. 



