PLATE XXII 



Described 

 on Page 



PAascolodon gidleyi Simpson. 31 



Fig. I. Fragment of left lower jaw with last two molars, external view. 

 X 3 diam. Type. U.S.N.M. No. 2703. Photograph from the United 

 States National Museum. 



Fig. 2. Same, internal view. X 3 diam. Photograph from the United 

 States National Museum. 



Afloconodon comoensis Simpson. 32 



Fig. 3. Fragment of right lower jaw with last two molars, internal view. 

 X 3 diam. Type. U.S.N.M. No. 2791. Photograph from the United 

 States National Museum. 



Trioracodon disulcus {Ma.rsh) . 34 



Fig. 4. Right lower jaw with parts of P4 and M1.3, external view. X 5 

 diam. Type. Y.P.M. No. 11851. 



Fig. 5. Same, crown view. X 5 diam. 



Fig. 6. Left lower jaw with M^ internal view. X 5 diam. Y.P.M. No. 

 10340. 



Fig. 7. Right lower jaw with P4 and M^.g, external view. X 5 diam. 

 Y.P.M. No. 10345. 



Priacodon robustus ( M arsh ) . 36 



Fig. 8. Left lower jaw with Pj.g, and Mj, external view. X 5 diam. 

 Y.P.M. No. 10343. 



Fig. 9. Left lower jaw with Pg and M1.3, internal view. X 5 diam. Type. 

 Y.P.M. No. 1 1846. 



Fig. 10. Same, external view. X 5 diam. 



214 



