708 GEOLOGICAL SURVEY OF THE TERRITORIES. 
PLATE VIII. 
Fic. 62.—Ossa innominata, Centrocercus, three or four days old, showing how the 
pelvic bones form the acetabulum: X, ilium; Y, ischium; Z, os pubis. 
Fig. 63.—Pelvis, same bird as in Fig. 57; Centrocercus; X, ilium; Y, ischium; Z, 
os pubis. 
Fig. 64.—The perfect pelvis, lateral view, as in 62 and 63, of Centrocercus; adult $ 
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