58 



M.W REPTILES AND STEGOCEPHALIANS FROM 



of the opisthotie and the openings look as much backward as upward; the posterior face 

 of the skull is very similar, except for the depressed paricto-squamosal bar; the post- 

 temporal opening is small, and the opisthotics extend out to the squamosal and are 



li... •.>:{. 

 Paleorhinws, after Lee*. Lettering as usual. 



A. Lateral view of skull. H. Upper view of skull. 



imuchus, after McGregor, 

 I). I '|>per view of skull. E. i/ower view of skull. 



C. Lower view of skull. 



F. Lateral view of skull. 



overlapped by it. In the specimen of M. planirostris, described by McGregor, the small 

 element on the outer .side of the distal end of the opisthotie is apparently calcified car- 

 tilage; in Promyttrumtckut the fragment in this position is true hone; the opisthotie 

 proces- standi a little higher above the condyle in Promydriomchus. On the lower 



