18 



MAltlNE EEPTILES Of THE OXEOED CLAT. 



that the inferior plate filled all the space between the opisthotic, stapes, and quadrate, 

 nor does its lower end seem to extend so far down as to pass under the upper lateral 

 margin of the stapes. It seems probable that in the skull figured by Gilmore the 

 squamosal and quadrate have been somewhat dislocated from their natural positions 

 with regard to one another. 



The supratem]}oral is missing or ci'ushed beyond recognition in most cases, but in 



Text-fln;. 9. 



Eight quadrate of Ophthalmosaunw : A, outer side ; B, inner side ; C, articular end. 



(E. 2133 : I nat. size.) 



a.h., anterior border ; a.i.a., antero-internal angle ; art., articular surface for mandible ; n., neck of bone ; 

 ji.e.a., postero-external angle ; pt. surface of union with pterygoid ; q.j.f-, facet for articulation with 

 quadrato-jugal ; sq., surface for union ■with the squamosal; st.f,, facet for outer end of stapes. (The 

 outlines of the surfaces for the squamosal and pterygoid are shown by dotted lines.) 



one (K. 2740) it can be seen that it was roughly triangular, overlapping the post- 

 orbital anteriorly, and sending forwards along it a process to meet the postfrontal. 

 The relations with the bones behind and above cannot be made out. 



The quadrate (PL I. fig. 10 ; text-fig. 9) is a large, broadly sickle- or rather ear-shaped 

 bone, consisting of a comparatively thin upper portion and a greatly thickened articular 



