Publications of the United Slates National Museum 



The scientific publications of the United States National Museum include 

 two series, Proceedings of the United States National Museum and United 

 States National Museum Bulletin. 



In these series are published original articles and monographs dealing 

 with the collections and work of the Museum and setting forth newly ac- 

 quired facts in the fields of Anthropology, Biology, Geology, History, and 

 Technology. Copies of each publication are distributed to libraries and 

 scientific organizations and to specialists and others interested in the 

 different subjects. 



The Proceedings, begun in 1878, are intended for the publication, in 

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

 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 which 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 botanical collections of the 

 Museum have been published in the Bulletin series under the heading 

 Contributions from the United States National Herbarium. 



This work forms number 220 of the Bulletin series. 



Remington Kellogg, 

 Director, United States National Museum. 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1961 



For sale by the Superintendent of Documents, U.S. Governnient Printing 0£Bce 

 Washington 25, D.C. - Price $1.25 



