OSTEOLOGY OF BIRDS 



103 



These remarks apply with less truth to specimens of F a 1 c 

 columbarius; we rarely, if ever, find a ramal vacuity upon 

 either side of the lower jaw. In all these falcons the supraoccipital 



Ju/.Sl. 



fuj.SZ. 



Fig. 51 Right lateral view of the skull of the Golden eagle (A. chrysaetos); 

 slightly tilted upward, the right side being the higher 



Fig. 52 Right lateral view of the skull of the White-headed eagle ( H . 1 e u c o - 

 cephalus); seen upon direct aspect. Both figures outlined from photographs and 

 jreduced about one fourth 



prominence is conspicuous, but never pierced by a foramen in any 

 of the material examined by me. 



In the nestling Sparrow hawk (Falco sparverius) we see 

 many points of interest that are in progress during the develop- 



