156 



wards tlie root of the neck (or perliapsthe withers). 



It is apparent that, for animals which carry 

 great weights in their mouths, as the Hon with its 

 prey, the pace — since it may commence with the 

 lower jaw as its initiative point — would be the most 

 advantageous. The sino^le-action locomotion of 

 the lion, &c., is, we believe, of this nature ; and it is 

 noticed in such animals, that the lower jaw articu- 

 lation is a simple hinge, without any lateral move- 

 ment,"^'" so that the body must rather move about 

 the lower jaw, than the lower jaw accommodate 

 itself to the movements of the body. 



These movement of the pace, however, would 

 more properly begin with a head-condyle and its 

 thorough action. It is in this way we suppose them 

 to be performed by the Horse and the Giraffe. 



The digastric loop may be released either with a 

 lateral movement of the lower jaw as at A' a'^ , or 

 by an extended lateral movement of the diaphragm 

 as the base of the lungs, or by a lateral movement 

 of the head as the basis from which the digastrics 

 hold ; which last again may be supplied by a still 

 freer lateral movement of the jaw. In the trot of 



* Possibly the fact that, from the absence of the bony partition be- 

 tween them, the (emporal muscle presses directly npon the eyeball in 

 these animals, may have sometlfing to do with so connecting the digas- 

 tric and the internal oblique of the eye that the lateral motion of the 

 jaw is less needed. 



