Il8 THE BRITISH REPTILES. 



With the Upper Chalk the era of the monster reptiles closes, the 

 fauna of the Eocene being of a much more modern type. Here we 

 have a crocodile, and a gariai, eight soft-shelled turtles of the 

 existing genus Trionyx, nine hard-shelled turtles (Argillochelys, 

 Lytoloma, Thalassochelys}, a pond tortoise (Emys cotnptont), a 

 leathery turtle (Eosphargis], two lizards, one (Laceria eocencf) of the 

 same genus as that now represented in the area, the other (Iguana 

 europcea) of a genus now only known in Tropical America ; an early 

 relative of the slow worm (Placosaurus), and three sea snakes 

 (Palceophis} as large as the largest pythons. No reptiles have as 

 yet been found in the Pliocene, but the Forest Bed has yielded 

 three, all existing, these being Tropidonotus natrix, the ringed snake, 

 Vipera berus, the viper, and Emys orbicularis, the European pond- 

 tortoise, not now living in this country, but ranging from Central 

 Europe into Algeria and Asia Minor. This tortoise, as will be seen 

 from the following list, is the only reptile discovered up to now in 

 our Pleistocene, which is almost as remarkable as that no remains 

 of reptiles or amphibians should have been found in our caves or 

 river deposits. 



As we gave a list of our mammals extinct and extant, we cannot 

 very well avoid giving one of the reptiles on the same plan, though 

 it is rather a heavy undertaking, and will occupy more space than 

 we can well spare. However, here we have it as complete as we 

 can make it : 



BRITISH REPTILES PAST AND PRESENT. 



CROCODILIA. 



CROCODILIDJE. 



Diplocynodon hantoniensis (Upper Eocene). 

 Ornithostoma (Cambridge Greensand). 

 Crocodilus cantabrigiensis (Cambridge Greensand). 

 Crocodilus icenicus (Cambridge Greensand). 

 Crocodilus spenceri (Lower Eocene). 

 Garialis dixoni (Middle Eocene). 

 Heterosuchus valdensis (VVealden). 



GONIOPHILIDJE. 



Hylaeochampsa vectianus (Wealden). 

 Theriosuchus pusillus (Middle Purbeck). 

 Goniophilis carinata (VVealden). 

 Goniophilis crassidens (Wealden). 

 Goniophilis simus (Middle Purbeck). 

 Goniophilis tenuidens (Middle Purbeck). 

 Nannosuchus gracilidens (Middle Purbeck). 

 Oweniasuchus major (Middle Purbeck). 

 Oweniasuchus minor (Middle Purbeck). 



