28 
Plate III 
Figure 1. C orythosaurus excavatus Gilmore. Plesiotype No. 8676. Disarticulated 
left nasal, i natural size. (Negative No. 77486.) 
Figure 2. C orythosaurus intermedins Parks. Plesiotype No. 8704, Geol. Surv., 
Canada.. Skull and jaws. } natural size. 
