TAB. XI. 



Fig. 

 1 — 7. Teeth of Polypfychodon interruptus, nat. size. 



From the Lower Chalk, near Lewes, Sussex. In the Museum of Mr. Potter, 

 of Lewes. 



8. Tooth of Polyjjtychodon ooutinum (?), nat. size. 



From the Lower Chalk of Sussex. In the Museum of Henry Catt, Esq., of 

 Brighton. 



