SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 75. NUMBER 3 



CAMBRIAN 

 GEOLOGY AND PALEONTOLOGY 



V 



No. 3— CAMBRIAN AND OZARKIAN 

 TRILOBITES 



(With Plates 15 to 24) 



BY 

 CHARLES D. WALCOTT 



es'^ VorbH 



(Publication 2823) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JUNE 1, 1925 



