12 ROYAL SOCIETY OF CANADA 



Plate II, 



Figure 4. — Exterior aspect of right squamosal of Monoclonius cana- 

 densis; one-sixth natural size. 



Figure 5. — Upper surface of front end of right lateral posterior exten- 

 sion of parietal of M. canadensis; similarly reduced. 



Figure 6. — Interior view of the squam'osal shown in figure 4; similarly 

 reduced. The dotted line in this figure and in figure 4 

 indicates the position of the parietal extension when 

 applied to the squamosal. 



Figure 7. — Lower surface of bone shown in figure 5 ; similarly reduced. 



Figures 7a, 7b, 7c. — Outlines of cross sections of the same at the points 

 indicated. 



