VI CONTENTS 



12. Walcott, Charles D. Cambrian Formations of the Rob- 



son Peak District, British Columbia and Alberta, 

 Canada 327 



July 24, 1913. Pp. [Title] -^327-343, pis. 55-59, text figs. 11, 12. 

 (Pub. No. 2186.) 



13. Walcott, Charles D. Dikelocephalus and other Genera of 



the Dikelocephalinse 345 



April 4, 1914. Pp. [Title] + 345-412, pis. 60-70, text figs. 13-20. 

 (Pub. No. 2187.) 



Index. Pp. 413-498. 



