PLATE IV 



Described 

 on Page 



fPsalodon mars hi Simpson. 27 



Fig. I. Left lower jaw with P^.j, external view. X 6 diam. Y.P.M. No. 



13672. 

 Fig. 2. Isolated right P4, external view. X 14 diam. Y.P.M. No. 13669. 



Psalodon fotens ( M arsh ) . 26 



Fig. 3. Right upper jaw with P^ and P*"*, crown view. X 8 diam. Y.P.M. 

 No. 10363. 



178 



