PLATE XXIII 



Described 

 on Page 



Priacodon ferox ( M arsh ) . 35 



Fig. I. Right lower jaw with P^.g and M1.3, internal view. X 5 diam. 

 Type. Y.P.M. No. 606. 



Trioracodon bisulcus {MdiXsh) . 34 



Fig. 2. Left upper jaw with P*'* and M^"^, external view. X 4 diam. 

 U.S.N.M. No. 2699. Photograph from the United States National 

 Museum. 



Fig. 3. Same, internal view. X 4 diam. Photograph from the United 

 States National Museum. 



Fig. 4. Left upper jaw with P* and M^"^, external view. X 6 diam. 

 Y.P.M. No. 10344. 



216 



