30 
Figure 15. Left quadrato-jugal of Edmontosaurus, Cat. No. 2289; j 
natural size. A, outer aspect; B, inner aspect; y, surface of contact 
with jugal; q, with quadrate. 
S</c sqc 
Figure 16. Left quadrate of Edmontosaurus, Cat. No. 2289; j natural size. A, external view 
obliquely from the front; B, internal view obliquely from behind; c, d, e,f, outlines of transverse 
sections ate', d', respectively, ar, surface for articular; y, for jugal; qj, for quadrato-jugal; pt, 
for pterygoid ; so , for surangular (mandibular cotylus); sq, for squamosal; sqc, reteived in squamosal 
cotylus. 
