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PROCEEDINGS OF THE NATIONAL MUSEUM 

 A B 



Figure 4. — Caudal vertebrae of Pinacosuchus mantiensis, type (U. S. N. M. No. 16592): 

 A, Anterior caudal centrum, ventral, lateral, and end views; B, more posterior caudal 

 centrum, ventral, lateral, and end views. All figures twice natural size. 



Figure 5. — Dermal spines and scutes of Pinacosuchus mantiensis, type (U. S. N. M. No. 

 16592): A, Short spine; B, elongate spine; C, ridged scute; D, asymmetrical spined scute. 

 All three times natural size. 



All these dermal structures were found disassociated in the matrix, 

 and thus no clue has been obtained as to the disposition or arrange- 

 ment of these ossifications in the skin. That they were a portion of 

 an elaborate ornamentation is clearly evident. 



