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. 



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



Tha-on'-tha. 



