THE BRITISH REPTILES. 123 



CHELONID&. 



Cimoliochelys benstedi (Lower Chalk). 

 Chelone hoffinanni (Chalk). 



73. Chelone imbricata (Existent), Hawk's- Bill Turtle. 

 Chelone jessoni (Cambridge Greensand). 

 Chelone obovata (Purbeck). 

 Argillochelys antiqua (Lower Eocene). 

 Argillochelys convexa (Lower Eocene). 

 Argillochelys cuneiceps (Lower Eocene). 

 Argillochelys subcristata (Middle Eocene). 

 Thallassochelys eocamica (Middle Eocene). 

 Lytoloma cantabrigiense (Cambridge Greensand). 

 Lytoloma crassicostatum (Lower Eocene). 

 Lytoloma longiceps (Lower Eocene). 

 Lytoloma planimentum (Lower Eocene). 

 Lytoloma trigoniceps (Middle Eocene). 



TESTUDINIDM. 



Testudo cantabrigiensis (Cambridge Greensand). 



Emys cooaptoni (Lower Eocene). 



Emys orbicularis (Forest Bed, Pleistocene, and 



Existent in Central Europe), European Pond 



Tortoise. 



Ocadia crassa (Upper Eocene). 

 Ocadia oweni (Upper Eocene). 

 Chrysemys bicarinata (Lower Eocene). 

 Chrysemys testudiniformis (Lower Eocene). 

 Protemys serrata (Lower Greensand). 



DERMA TEM Y DID IE . 



Trachyaspis hantoniensis (Upper Eocene). 



CHELYDRIDJE. 



Tretosternum bakewelli (Wealden). 

 Tretosternum punctatum (Wealden). 

 Anosteira anglica (Upper Eocene). 

 Pseudotrionyx dellieidi (Lower Eocene). 



ACICHELYID&. 



Thalassemys longii (Kimeridge Clay). 

 Thalassemys ruetimeyeri (Purbeck). 

 Pelobatochelys blakei (Kimeridge Clay). 

 Tropidemys langi (Kimeridge Clay). 



