PLATE CCXVIII 



Pelvis and Sacrum of the Type of Brontops robustus Marsh 



Plate prepared under th? direction of Professor Marsh. Front view. One-fourth natural size. (See pp. 668, 694) 



a, Acetabulum; c, crest of ilium; /, /, obturator fenestra; il, ilium; is, ischium; p, pubis; s, sacrum; z, prezygapophysis of first 

 sacral vertebra. 



