134 



That end of the shoulder blade lohich carries the 

 shoulder joint socket lies on the anterior ground end 

 of the true ribs, and is guided by the moyements 

 of this part, which amounts tofolloiving the move- 

 ments of the front part of bearers of the convex 

 •{§ 62) and the upper end of the sternum.^ 



The upper end of the sternum moves with the 

 stemo-mastoids, and they, finally, move with the 

 neck S. 



At the formation of the left anterior winding- 

 line, in both its sections, the propeller true ribs (on 

 the rear portion of the convex) would so move the 

 right shoulder blade that the right fore-foot will 

 rest on its outer bearing ; the estabhshment of the 

 primary section will so alter the shape of the ribs 

 as to bring the shoulder socket more against the 

 bearers. The upper end of the sternum is carried 

 somewhat toward the left. 



At the formation of the right posterior Hue the 

 upper end of the sternum is carried toward the left, 

 at least relatively, by the movement of its posterior 

 end to the right, as the left hind foot comes on to 

 its inner bearing. This movement of the sternum 

 brings the right fore-leg on its inner bearing by the 

 movement of its shoulder socket. 



* The clavicle which exists in some animals would compel this. 



