UNITED STATES NATIONAL MUSEUM BULLETIN 272 



Comprehensive Revision of a 



Worldwide Collection 



of Freshwater Sponges 



(Porifera: Spongillidae) 



J. T. PENNEY 



Formerly of University of South Carolina (1900-1964) 



and 



A. A. RACEK 



University of Sydney, N.S.W., Australia 



SMITHSONIAN INSTITUTION PRESS 



WASHINGTON, D.C. 



1968 



For sale by the Superintendent of Documents. U.S. Government Printing Office 

 Washington, D.C. 20402 - Price $1.50 (Paper Cover) 



