April, 1901] 



Osborn — Zoological Notes. 



89 



duced, make lines like those observed. Pitfalls and furrows are 

 illustrated in the accompanying plates, the furrows being quite in- 

 distinct, as tliey are not deep enougii to produce distinct shade, and 

 consequently do not show conspicuously in the photograph. Fur- 

 rows are to be noted, however, in the figure (No. 3) above the points 

 marked X. 



Fig 4. — Eagle Nest. 



Photo liy R F. Griggs. 



Fig. 5. — Eagle Nest. 



Photo by H. Obborn. 



