200 
TEETIARY VEiriEBlUTA OP TJIE EAYtjM. 
liilther ill advance of its middle point, and about beneath the anterior border of the orbit, 
its front portion is bent down, making an angle of about 140° with the posterior part. 
The alveolar border forms a double curve ; posteriorly it is convex outwards, so that 
the palate is much wider opposite the middle molars than at any other point. In the 
jiremolar region the border is concave outwards, so that the palatal surface is greatly 
narrowed, the narrowest point being about opposite the tooth here called the second 
premolar. In front of this the border thickens and turns outwards to the canine 
alveolus (c.), immediately in front of which is the maxillo-premaxillary suture. On the 
palate the maxilla extends rather further forwards, terminating as the posterior edge of 
Text-fig. 64. 
Middle portion of roof of sluill ol Eoslvcn llhi/ca- 
fr., fronfals ; na., nasals ; pa., parietals ; pmx., pretnaxillaj. f nat. size. 
the large median anterior palatine foramen {a.])f.). The tacial surface of the anterior 
part of the maxilla is nearly flat and vertical. Posteriorly it bears a broad shelt-like 
zygomatic prominence, which forms the floor of the orbit and is perforated in front 
by a large antorbital foramen. 
The j)remaxill<B (pmx.) form the greater part of the downwardly turned rostrum ; 
the suture between these bones and the maxillae, after crossing the alveolar border, 
runs first upwards and backwards, then nearly directly backwards, terminating about the 
level of the hinder border of the narial opening (nar.). Here they join the anterior end 
of tlie frontals, thus, as above mentioned, excluding the maxillae from any share in the 
