44 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



what may be regarded as tlie main brace of the quadrate. Tl;e 

 braincase lies in the V-shaped interval between these two main braces 

 of the quadrate almost adjoining it, and it is to be observed that the 

 points of articulation of the lower jaw are widely spread apart and 

 occupy a position nearly as far back as the tip of the occipital condyle. 



It is also to be noted that the articulations of the lower jaw lie upon a. 

 plain much below the base of the brain. Between the well-fixed 

 quadrate and the side wall of the brain case there is a relatively large 

 space which is occupied by the powerful pterygoid and temporal mus- 

 cles, which close the jaws, and is in direct relation with the biting 

 povv'ers of the animal as well as its dental armature. 



