Plate I. Stegoceras validus; Cat. No. 138. 



Figure 1. Inferior aspect; natural size. 



Figure 2. Right lateral aspect; natural size. 



Abbreviations. — ^1/5, alisphenoid; £j;o, exoccipital; F, frontal; ///, laterotemporal 

 fossa; n, suturai facet for nasal; Ol, otic mass; ore, orbit; Ori, orbitosphenoid; 

 P, parietal; Pof, postfrontal; Por, postorbital; prj, suturai facet for 

 prefrontal; Pasp, parasphenoid ; Psp, presphenoid; psq, process of 

 squamosal; Soc, supra -occipital; sor, suturai facet for supra-orbital; Sq, 

 squamosal; igc, squamosal cotylus for head of quadrate; stf, supratemporal 

 fossa ; a, broken surface. 



