86 
Flate XI 
Skull and lower jaw of Hypacrosaurus altispinm Brown. No. 8501, Cleol. Surv., Can. \ iewed 
from the right side. The right maxilla and attached jugal are pushed forward out of position and 
the region above the infratemporal vacuity has suffered crushing in a vertical direction. Dn, 
dentary; Fr, frontal; Ju, jugal; Mx, maxillary; Na, nasal; oc, occipital condyle; Pmx, premaxillary; 
Po, postorbital; Pac, paraoccipital process; Qj, quadratojugal; Qu, quadrate; Sq, squamosal; Sur, 
surangular. About eleven-sixteenths natural size. (PaguSO.) 
