verging to meet medially, the lateral boundary is the 

 lachrymal margin of the maxilla. This foramen transmit* 

 a nerve and a blood vessel only, there is no naso-lachrymal 

 duct. The posterior nasal passage is walled in below, 

 laterally and above by the palate bone, medially by the 

 body of the vomer. The two choanse open close together 

 into a broad semicircular depression, deep in front and 

 shallow behind (foam nasopalatina) [G8] which in the entire 

 specimen is divided bv a. median earl llanimms septum. The 

 nasopalatine fossa is bounded in front and laterally by the 

 arcuate margin of the palate, and may be said to extend 

 back as far as the pterygo-vomerine suture. 



The palate (Fig. 47) is bounded laterally and in front by 

 the alveolar margin. Behind, it presents on either side a 

 free border to the zygomatic fossa, and between these its 

 arcuate margin bounds the nasopalatine fossa. The most 

 noteworthv feature is the very expansive vomerine con- 

 stituent, larger in this and nearly related forms than in 

 any other reptiles. The vomer is flanked on either side 

 behind by the two palate bones; these three bones articu- 

 late on either side with the maxillae, parallel to the 

 "oblique palatine suture" thus formed, is a prominent 

 ridge (diiijc-r musi icil orinsY .12 ■ beset with conical tubercles. 

 Behind the palatine plates of the maxillae the pterygoid 

 process of the jugals contribute a narrow area [5] to the 



The Foramen Magnum (Fig. 43) is almost completely 

 enclosed by the exoccipital bones, the supra occipital takes 

 a small share above, but the basioccipital is excluded from 

 the foramen. 



The trifaceted occipital condyle stands well out beyond 

 the plan.' of the foramen magnum. The exoccipital bones 

 take the major share in the formation of the body of the 

 condyle and bear two of the three articular facets. Their 



