PTEROPODA. 



KEPTILIA. 



Carbon if erous. 

 M. Eocene. 

 U. Eocene. 



L. Cretaceous. Wealden. 

 U. Oolite. Portland. 

 L. Cretaceous. Wealden. 

 U. Cretaceous. L. Chalk. 

 L. Eocene. 



