25 
but the same thin laminate bone. Has only a slight 
articulation with the meso-pterygoid in front instead of 
the extensive one of the other side. 
Meso-pterygoid.—Not attached to the dorsal edge of 
the pterygoid but to its inner face. It hence occupies a 
different plane to that of the meta-pterygoid. It is further 
much smaller on this side. 
Pterygoid. —This is of a different shape on this side. 
The forward thin rod is here thick and in fact stouter 
than the remainder of the bone, which is reduced and 
apparently merged into the forward portion. The left 
pterygoid is both larger and stouter than the right—thus 
differing from the left palatine, as will be seen below. 
Palatine.—Greatly modified on this side. Its anterior 
extremity articulates directly with the upper end of the 
maxilla instead of by the intervention of a short ligament. 
In one specimen there was also a short hgament contain- 
ing a sesamoid connecting the same extremity with the 
anterior forward process of the pre-frontal. Behind the 
anterior end there is a strong dorsal articulation with the 
pre-frontal which is not found on the other side. The 
ligamentous connection with the vomer also exists on this 
side, but is apparently with the vomer only. The articu- 
lation with the pterygoid is also different, the posterior 
extremity of the palatine being forked and the pterygoid 
fitting into the split thus formed, the interstices being 
filled with cartilage. The left palatine is much shorter 
than the right, but is more robust (ep. the pterygoid). 
3.—THE Jaw Apparatus (Fig. 5). 
Ocular Side. 
Articular (Ar.).—Has a saddle-shaped articular sur- 
face for the quadrate, behind which it sends up a promi- 
