Proceedings of 

 the United States 

 National Museum 



SMITHSONIAN INSTITUTION . WASHINGTON, D.C. 



Volume 124 1968 Number 3645 



Numerical Approaches to the Relationships 



of Certain American Swimming Crabs 



(Crustacea: Portunidae) 



By W. Stephenson, W. T. Williams, 

 and G. N. Lance 1 



Research for this paper was financed partially by the National 

 Science Foundation, which enabled one of us (W. S.) to examine 

 material in the United States National Museum, Smithsonian Insti- 

 tution, and partly by the University of Queensland Research Grants 

 Committee for completion of the analysis. We wish to thank the 

 directors and curators of Crustacea of the following museums for 

 allowing access to their material: Allan Hancock Foundation, Uni- 

 versity of Southern California, Los Angeles, Calif.; U.S. National 

 Museum, Smithsonian Institution, Washington, D.C; and Scripps 

 Institute of Oceanography, La Jolla, Calif. We also wish to thank 

 Miss May Rees, Department of Zoology, University of Queensland, 

 Brisbane, for valuable assistance in certain computations, in compila- 

 tion of references, and in model construction. 



This paper attempts an assessment of the status and interrelation- 

 ships of various taxa of American portunids within the genera Portunus 



1 Stephenson: Department of Zoology, University of Queensland, Brisbane; 

 Williams and Lance: Computing Research Section, Commonwealth Scientific 

 and Industrial Research Organization, Canberra, Australia. 



1 



