TAB. XIV. 



Fig. 

 1 and 2. Crown of the tooth of Polypti/chodon interrujdus. 



3. Outhne of the base of the same tooth. 



From the Chalk of Sussex. 



4. Crown of the tooth of Polyptychodon continuus. 



From the Chalk of Kent. In the Collection of H. W. Taylor, Esq., of Brixton 

 Hill. 



5. Crown of the tooth of Polyptychodon continuus. 



6. Longitudinal section of the same tooth . 



From the Kentish Rag, Green-sand Formation, near Maidstone. In the 

 Collection of J. Bensted, Esq. 



All the figures are of the natural size. 



