Smithsonian Report, 1915. — Walcott. 



Plate 15. 



Middle Cambrian Crustaceans. 



1-3. Biinjessiabella WaAcott; 4,5. Waiitiiifiddcnai.iVii'aU-ott; 6. Opabiniarcf/alis Walcott. 

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



