EXPLANATION OF PLATE XXII 



Clidastes planifrons, Copo, one-half natural size. 



Fig. 1. Superior view of parts of cranium preserved, including parts of the parietal (a), postfroutal (&), 

 prefrontal (rf), and fronto-nasal (c) elements. 



2. The same, seen from below. 



3. Posterior part of left mandibular ramus, without angle. 



4. Median portion of right mandibular ramus, showing hinge. In both figures, a is the coronoid, 6 



the Burnngular, e angular, d articular, and e splenial. 



5. Portion of the right quadrate bono: 5, proximal part, inner view; 5 a, proximal view of tho 



same ; 5 b, external view of the same. 

 G. Distal portion of left quadrate, external view ; 6 a, internal view ; G b, posterior view. 

 7. Eight palatine bone, from below ; 7 o, right palatine bone, from outer side. 



