SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 64, NUMBER 5 



CAMBRIAN 

 GEOLOGY AND PALEONTOLOGY 



III 



No. 5. CAMBRIAN TRILOBITES . 



(With Plates 45 to 67) 



BY 

 CHARLES D. WALGOTT 



(Publication 2420) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



SEPTEMBER 29, 1916 



