50 THE ROYAL SOCIETY OF CANADA 



superior median one, the former extending beneath the dentaries, the 

 latter tabove the symphyseal contact. It is probable that the single 

 superior process is present in Panoplosaurus above the median pair. 



Although the predentary in the specimen is encased in armour 

 externally its shape is clearly indicated by a groove where its bony 

 covering meets that of the dentaries. Inferiorly a small part of the 

 armour has been broken off, revealing the median pair of tongue- 

 shaped processes. That portion of the anterior ends of the dentaries 

 underlapped by the predentary is, as would be expected, devoid of 

 armour. 



Occipital Condyle. The occipital condyle faces downward and 

 slightly backward, and has a short thick neck. The articular surface 

 is strongly convex, broader than high, reniform in outline with the 

 greater curvature below. It is 58 mm. broad and 41 mm. high. 



The head was evidently held much as in Stegosaurus but with a 

 greater downward inclination. In the type when the skull is placed 

 in position on the neck its axial line, from the floor of the foramen 

 magnum to the anterior premaxillary border of the mouth, makes an 

 angle of about 160 degrees with the direction of the neck. 



The foramen magnum is elliptical in outline, with the greatest 

 diameter transverse. It is 37 mm. wide and 25 mm. high. 



