102 



THE VERTEBRATE SKELETON. 



The largest bone in the shoulder girdle is the clavicle 

 (tig. 13, 3), which is irregularly crescent shaped, thick in front 



FIG. 13. THE EIGHT HALF or THE PECTORAL GIRDLE AND RIGHT 

 PECTORAL FIN OF A COD (Gadus morrhua) x \ (Brit. Mus.). 



post-temporal. 5. scapula, 



supra-clavicle. 6. post-clavicle, 



clavicle. 7. bracbial ossicles, 



coracoid. 8. dermal fin-rays. 



and tapering off behind. To the outer side of its upper part 

 is attached a thick cylindrical bone, the supra-clavicle, which 

 passes upwards and is connected with a strong V shaped 

 bone, the post-temporal. The apex of the V meets the supra- 

 clavicle, the inner limb articulates with the epi-otic process, 

 the outer with the parotic process. Projecting downwards from 

 the upper part of the clavicle is a long bony rod, flattened 



