﻿PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



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SMITHSONIAN INSTITUTION 

 U. S. NATIONAL MUSEUM 



Vol. 102 Wa.hington: 1952 No. 3291 



CONTRIBUTIONS TO THE MORPHOLOGY AND TAXONOMY 

 OF THE BRANCHIOPODA NOTOSTRACA, WITH SPECIAL 

 REFERENCE TO THE NORTH AMERICAN SPECIES 



By FOLKE LiNDER 



INTRODUCTION 



Since the days when Packard's "Monograph of the Ph3dlopod 

 Crustacea of North America" was published (1883), the accessible 

 material of notostracans has grown considerably, and the principles 

 commonly used for the taxonomy have been discussed in several 

 papers. Analyses of these characters, especially by Bracm (1893), 

 Gurney (1923, 1924), Sidorov (1927), Barnard (1929), and Gauthier 

 (1934), have established a considerable variation in most of the char- 

 acters of European, Asiatic, and African forms. This variation, of 

 course, does not make a survey of the Notostraca of North America 

 an easy task, and when I venture such a siu-vey here, I wish to note 

 that in some respects it is tentative only. It is based mainly upon a 

 study of the collections of the U. S. National Museum, amounting to 

 109 lots and considerably more than 2,000 specimens. This study was 

 performed during a 3 months' visit to the Museum in 1946, and was 

 made possible by a grant from the Smithsonian Institution, to which 

 my thanks are due for this generous support. I am also greatly 

 indebted to Dr. Waldo L. Schmitt and other officials of the Museum 

 for having most Idndly facilitated my work. Also, Prof. J. E. 

 Lynch, University of Washington, Seattle, Idndly allowed me to 

 examine some important material from the northwestern United 

 States. For comparison I had specimens from other parts of the 

 world, though this material, about 3,000 specimens from 71 localities, 

 has not been as comprehensive as could be desired. 



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/^PP 6 1955 



