North American Fauna No. 27, U S Dept Agr. Biological Survey. 



Plate XII. 



Fig. 1.— Summit of Mount Tha-on'-tha, Showing Stunted Vegetation and Coral- 

 bearing Rocks. 



1 1 iiiilmiiiiiiiii 



Fig. 2.— Junction of Nahanni River with Mackenzie, from Summit of Mount 



Tha-on'-tha. 



