SMITHSONIAN MISCELLANEOUS COLLECTIONS 



PART OF VOLUME LIII 



CAMBRIAN 

 GEOLOGY AND PALEONTOLOGY 



No. 2.— CAMBRIAN TRILOBITES 



With Six Plates 



BY 



CHARLES D. WALCOTT 



No. 1805 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



April 25, 1908 



