TAB. IX. 



Fig. 



1 . Part of the lower jaw of Mosasaurus gracilis, nat. size. 



la. Part of the upper jaw of ditto. 



2. Body of a lumbar vertebra of ditto. 



3. Body of a dorsal vertebra of ditto. 



4. Anterior concave surface of the same vertebra. 



5. Anterior view of a mutilated caudal vertebra, showing the much expanded 



haemal arch e. 

 From the Upper Chalk, at OfFham-pit, Sussex. In the Collection of Henry 

 Catt, Esq., of Brighton. 



6. Under view of the body of a cervical vertebra of Plesiosaurus constridus. 



7. End view of the same vertebra. 



From the Steyning Chalk-pit, Sussex. 



8. Tooth of a Plesiosaurus. 



From the Scaddlescombe Chalk-pit, near Lewes, Sussex. 



9. Tooth of a Plesiosaurus. 



From the Southeram Chalk-pit, Sussex. 



10. Tooth of a Plesiosaurus. 



From the Southeram Chalk-pit, Sussex. 



1 1 . Tooth of Polyptychodon interruptus. 



12. Base of the same tooth. 



From the Chalk, near Valmer, Lewes. 



13. Nine dorsal vertebrae of a Lizard {Coniosaurus crassklens). 



14. Part of the lower jaw and some attached vertebrae of Coniosaurus crassidens. 

 \4a. A magnified tooth of ditto. 



15. View of part of the alveolar groove and teeth of ditto. 



15« A magnified hinder tooth of ditto. 



From the Lower Chalk at Clayton, Sussex. In the Collection of Henry Catt, 

 Esq., of Brighton. 



All the figures are of the natural size. 



