vi
CONTENTS
| 12. | Walcott, Charles D. Cambrian Formations of the Robson Peak District, British Columbia and Alberta, Canada | 327 |
| July 24, 1913. Pp. [Title] + 327-343, pls. 55-59, text figs. 11, 12. (Pub. No. 2186.) | ||
| 13. | Walcott, Charles D. Dikelocephalus and other Genera of the Dikelocephalinæ | 345 |
| April 4, 1914. Pp. [Title] + 345-412, pls. 60-70, text figs. 13-20. (Pub. No. 2187.) | ||
| Index. Pp. 413-498. |
