364 



SKELETON OF BIRDS. 



some power of motion; and the lower, instead of directly articu- 

 lating with the cranium by a projecting condyle, as in the 



Interorbital 

 Orbit. partition. 



Lachrymal 

 bone. 



FIG. 177- SKELETON OK VULTURE. 



vc t cervical vertebras; vs, sacral vertebrae ; vq, caudal vertebras ; cl, clavicle ; h, hume- 

 rus ; o, bones of forearm ; ca, carpus ; ph, phalanges ; st, sternum ; /, femur ; t, tibia ; 

 ta, tarsus. 



Mammalia, is suspended to a moveable bone named the tympanic 

 bone, or vs quadratum, which is analogous to a portion of the 



temporal bone de- 

 tached from the 

 main part, to which 

 it is united in the 

 preceding class. 

 Each of the branches 

 of this jaw is com- 

 posed of two pieces, 

 quadrat. i ns tead of being 



FIG. 178.-SKULL OF EAGLE. formed of a single 



bone; and it is by 

 a cavity, not by a projecting condyle, that it articulates 



Nostril. 



Upper Ji 



