SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 57, NUMBER 13 



CAMBRIAN 

 GEOLOGY AND PALEONTOLOGY 



II 



No. 13.— DIKELOCEPHALUS AND OTHER GENERA 

 OF THE DlKELOCEPHALINyt 



(With Plates 60 to 70) 



BY 

 CHARLES D. WALCOTT 



(Publication 2187) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



APRIL 4, 1914 



