Publications of the United States National Museum 



The scientific publications of the United States National Museum 

 include two series, Proceedings of the United States Nationcd Museum 

 and United States National Museum Bulletin. 



In these series are published original articles and monographs deal- 

 ing with the collections and work of the Museum and setting forth 

 newly acquired facts in the field of anthropology, biology, geology, 

 history, and technology. Copies of each publication are distributed to 

 libraries and scientific organizations and to specialists and others in- 

 terested in the various subjects. 



The Prooeedings^f begun in 1878, are intended for the publication, in 

 separate form, of shorter papers. These are gathered in volumes, oc- 

 tavo in size, with the publication date of each paper recorded in the 

 table of contents of the volume. 



In the Bulletin series, the first of which was issued in 1875, appear 

 longer, separate publications consisting of monographs (occasionally 

 in several parts) and volumes in w^iich are collected works on related 

 subjects. Bulletins are either octavo or quarto in size, depending on 

 the needs of the presentation. Since 1902, papers relating to the bo- 

 tanical collections of the Museum have been published in the Bulletin 

 series under the heading Contributions from the. United States Na- 

 tional Herbarium. 



This work forms number 291 of the Bulletin series. 



Frank A. Taylor 

 Director^ United States National Museum 



IV 



