Smithsonian Report, 1915.— Walcott. 



Plate 17. 



Lower Cambrian Trilobites. 



1. Holmia f maccr Wnlcott; 2-10, Oleiiellus trucma7ii\^''a.lcott. 



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

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



