G1 
Figure 17. Ischia of Hypacrosaurus, side view. A, right ischium of Hypacrosaurus altispinus 
Brown. Type, No. 5204, A.M.N.H. B, expanded distal end with mate drawn in outline^ After 
Brown. C, left ischium (reversed) of Hypacrosaurus altispinus. No. 8501, Geol. Surv., Can. 
Both figures one-ninth natural size. 
68675 — 5 
