Smithsonian Report, 1915. — Walcott. 



Plate 17. 



4M| 



Lower Cambrian Trilobites. 

 1. Holm ia ? macer Wnlcott; 2-10, Olencllus tmcma7^i^XsLlcott. 



Mahto formation: From Mumm Peak, 6 miles north of Robson Peak and northwest of Yellow- 

 head Pass, in western Alberta. (See pi. 14). 



