ADVERTISEMENT. 



The publications of the National Museum consist of two series: 

 Proceeding's and Bulletins. 



The Proceeding's, the first volume of which was issued in 1878, are 

 intended primarily as a medium of publication for newly-acquired 

 facts in biology, anthropology, and geology, descriptions of new forms 

 of animals and plants acquired })y the National Museum, discussions 

 of nomenclature, etc. A volume is issued annual!}^ for distribution to 

 libraries, while in view of the importance to science of the prompt 

 publication of descriptions of new species, a limited edition of each 

 paper is printed in pamphlet form in advance. 



The present volume is the twent^^-third of the series. 



The Bulletin, publication of which was begun in 1875, is a series of 

 elaborate papers, issued separately and based for the most part upon 

 collections in the National Museum. They are monog'raphic in scope, 

 and are devoted principally to the discussion of larga zoological 

 groups, bibliographies of eminent naturalists, reports of expedi- 

 tions, etc. 



A quarto form of the Bulletin, known as the "Special Bulletin," 

 has been adopted in a few instances in which a larger page was deemed 

 indispensable. 



The Annual Report of the National Museum (being the second vol- 

 ume of the Smithsonian Report) contains papers chiefly of an ethno- 

 logical character, describing collections in the National Museum. 



Papers intended for pulilication by the National Museum are usuall}^ 

 referred to an advisory committee, composed as follows: Frederick 

 W. True (chairman), William H. Holmes, George P. Merrill, James 

 E. Benedict, Otis T, Mason, Leonhard Stejneg'er, Lester F. Ward, 

 and Marcus Benjamin (editor). 



S. P. Langlet, 

 Secj'etary of the Smithsoman Institution. 



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