662 BIRDS. 
hyoid consists of a flat “body,” with anterior and posterior 
“horns,” the latter derived from the first branchial arch. 
The pectoral girdle consists of sabre-like scapulz extend- 
ing dorsally over the ribs, of stout coracoids sloping ventrally 
. 
’ 
adius 3 #., ulna; ¢., carpals 
primary feathers. 
Wing of dove. 
iPS 
feathers ; ~ 
Fic. 365. 
4., Humerus; s.f, secondary 
mc., Carpo-metacarpus 
and articulating with the sternum, of the clavicles which are 
united by the interclavicle to form the merrythought or 
furcula. The opening left where the upper ends of the 
clavicles touch the scapula and coracoid is called the fora- 
men triosseum. 
