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 they are not deep enough 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. 
Fig. 5. — Eagle Nest. 
Phcto by R F. Griggs. 
Photo by H. Osborn. 
