SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 64, NUMBER 3 



CAMBRIAN 

 GEOLOGY AND PALEONTOLOGY 



III 



No. 3. -CAMBRIAN TRILOBITES 



(With Plates 24 to 38) 



BY 



CHARLES D. WALCOTT 



(Publication 2370) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JANUARY 14, 1916 



