90 



MAEESTE EEPTILES OF THE OXFOED CLAY. 



directed outwards and forwards ; behind this the teeth become smaller and are directed 

 more upwards. Throughout the alveolar region there is within the line of functional 

 alveoli a series of pits, in which the tips of the replacing teeth appear. Within this again 

 is a groove apparently running along the line of union of the dentavy and splenial. 

 There are about twenty teeth on each side of the mandible. The exact arrangement 

 of the splenials {spl.) is not clear; they seem to form most of the inner surface of 



Text-fig. 48. 



ang/. 



cmg. 



Posterior portion of right ramus of mandible of Murcmosaurus platydis : A, inner face ; B, outer face. 



(E. 2678, type specimen, f nat. size.) 

 ang., angular ; g., groove on inner face of angular ; s., probable suture between angular and articular 

 surangular; s.ang. S,- art., united surangular and articular; s.d., sutural surfaces for union with the 

 dentary ; sjil., coronoid process of splenial. 



the mandibular ramus ; their lower border is separated from the dentaries by a deep 

 Meckelian groove, which is continued posteriorly on the inner face of the angular 

 (see text-fig. 48, g.). They do not appear to have actually met in the symphysis (except 

 perhaps for a short distance on the ventral surface), but are separated by a narrow 

 wedge formed by the dentaries. Posteriorly it appears that they rise to form the 



