EXPLANATION OF PLATE 10. 



Fig. 1. Posterior portion of skull, Camptosanrus dispar Marsh. Cat. No. 5473, 

 U.S.N.M. ^ nat. size. Seen from above. From a photograpb. 

 2. Explanatory figure of same. nl. sp., alisphenoid ; c, occipital condyle; 

 /, frontals; p, parietal; />/. postfrontal ; puc, paraoccipital process 

 or opisthotic; so, supraoccipital. 



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