PLATE X. 



Fig. 1. Trachodon (Pteropelyx) marginatus, Lambe, left pubis, external view ; one-third the natural 

 size. (Provisionally associated with T. marghiatus). Page 74. 



Fig. 2. Trachodon (Pteropelyx) marginatus, left ischium, e.^cternal view ; one-fifth the natural size. 

 (Provisionally associated with T. marginatus). Page 75. 



i, iliac facet ; b, acetabular border ; g, ischiac facet ; h, postpubic process ; p, pubic facet ; ])p, 

 postpubic facet ; /, flange. 



