EXPLANATION OF PLATE 0. 



Fiu. 1. Posterior part of skull. Camntosauru.s ainplus? Marsh. No. 1887, Yale 

 Museum. | nat. size. Internal view, 

 o Explanatory figure of same: ang, angular; art, articular; co, coro- 

 noid; /. internal mandibular foramen?; h, hyoid; p, art, prearticu- 

 lar; pt, pterygoid; q, quadrate; s, splenial. 



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