PLATE CCXIX 



Pelvis and Sacrum of the Type op Beontops eobustus Marsh 



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



1, Superior view; 2, inferior view, a, Acetabulum; c, crest of ilium; /, /, obturator fenestra; is, ischium; p, pubis; s, sacrum; 

 s', caudo-sacral vertebra; z, prezygapophysis of first sacral vertebra. 



