SMITHSONIAjN MISCELLANEOUS COLLECTIONS 



VOLUME 144, NUMBER 3 

 (End of Volume) 



Cfjarles; 3B. an6 iWarp "Paux liEalcott 

 Eesearci) Jf un& 



REVISION OF THE 

 CASSIDULOID ECHINOIDS 



(With 44 Plates) 



By 

 PORTER M. KIER 



Associate Curator, Division of Invertebrate Paleontology 



and Paleobotany 



United States National Museum 



Smithsonian Institution 



(Publication 4500) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JUNE 26, 1962 



