Smithsonian Report, 1 91 5.— Walcott. 



Plate 15. 



^W^c'^'l 



A / 



Si*^' 



Middle Cambrian Crustaceans. 



1-3. Btirgrssia bellaW iilcott; 4,5. Waptiafiddcnsis Wixlcott; 6. Opabinia regalis W\i\cott, 

 From Burgess Pass fossil quarry, near Field, British Columbia. 



