The Skeleton re; 
III. The Ribs and Sternum. 
The Cervical Ribs. As noted above, all of the 
cervical vertebree possess ribs. The first rib, 
Fic. 25. Hyoms oF aN ALLIGATOR (Caiman latirostris) 
(TO THE LEFT) AND OF A GREEN TuRTLE (Chelone midas) (To 
THE RIGHT). X§%. (Brit. Mus.) (After Reynolds.) 
The cartilaginous portions are dotted. 
1. basilingual plate or body of 8. first branchial arch (anterior 
the hyoid. cornu). 
2. hyoid arch.; 4, second branchial arch (pos- 
terior cornu). 
attached to the atlas, consists of a single, long blade 
projecting backward at an acute angle (Fig. 17, 8) 
as far as the middle of the fourth vertebra. As 
described above it articulates with the atlas at but 
one place. All of the other cervical ribs have two 
articular surfaces, a tuberculum and a capitulum, 
