THE BRITISH REPTILES. 



117 



Cororiella austriaca, 80 

 Coronella lasvis, 89 



Dermatochelys atlantica, 74 

 Dermatochelys coriacea, 74 

 Dermatochelys porcata, 74 

 Dermochelys coriacea, 74 



Eretmochelys squamata, 73 



Lacerta aedura, 76 

 Lacerta agilis, 76, 77 

 Lacerta arenicola, 77 

 Lacerta bilineata, 78 

 Lacerta bistriata, 78 

 Lacerta catenata, 77 

 Lacerta chloronota, 78 

 Lacerta chrysogaster, 76 

 Lacerta crocea, 76 

 Lacerta elegans, 78 

 Lacerta europsea, 77 

 Lacerta montana, 76 

 Lacerta nigra, 76 

 Lacerta practicola, 76 

 Lacerta rosea, 77 

 Lacerta sepium, 77 

 Lacerta smaragdiria, 78 

 Lacerta stirpium, 77 

 Lacerta varius, 78 

 Lacerta viridis, 78 

 Lacerta vivipara, 76 

 Lacerta vulgaris, 77 



Natrix dumfrisiensis, 80 

 Natrix torquata, 79 

 Natrix vulgaris, 79 



Pelias berus, 81 



Sphargis coriacea, 74 

 Sphargis mercurii, 74 

 Seps argus, 77 

 Seps ccerulescens, 77 

 Seps ruber, 77 

 Seps stellatus, 7^ 

 Seps terrestris, 78 

 Seps varius, 77 



Testudo caretta, 73 

 Testudo coriacea, 74 

 Testudo imbricata, 73 

 Testudo lyra, 74 

 Testudo mercurii, 74 

 Testudo tuberculata, 74 

 Tropidonotus natrix, 79 

 Tropidonotus persa, 79 



Vipera berus, 81 

 Vipera communis, 81 

 Vipera vulgaris, 81 



Zootoca muralis, 76 

 Zootoca vivipara, 76 



The fossil reptiles of the British area at present known are 

 nearly four hundred in number. The oldest genus is Protorosaurus, 

 represented by two species in the Permian Marl Slate, and reptilian 

 remains have been collected from every succeeding formation up to 

 the Oligocene. In the Trias we have Palceosaurus and Rhyncosaurus, 

 and, amongst others, that most curious form Elginia, in which the 

 skull has so many protuberances and the third eye is so clearly 

 shown on the top ot the head. In the Rhaetics are three Plesio- 

 saurs their first appearance the Ichthyosaurs and Steneosaurs 

 beginning in the Lias. The Oolites have yielded three Cetiosaurs, 

 ten Cimoliosaurs, seven Ichthyosaurs, all the nine Pliosaurs, and 

 one species of Pterodactyl, and three of the allied genus Rhampho- 

 rhynchus, besides representatives of some two dozen other genera. 

 From the Purbecks have come, in addition to the ten genera of 

 mammals, about seventeen genera of reptiles, among them the oldest 

 turtle, Chelone obovata. In the Wealden the reptilian genera are 

 almost as numerous, the most familiar being, perhaps, Iguanodon. 

 The Cretaceous rocks are also rich in reptiles, among them being 

 the sea-serpents, Mosasaurus, Dolichosaurus, and Leiodon. 



