126 THE BRITISH REPTILES. 



Plesiosaurus hawkinsi (Lower Lias). 

 Plesiosaurus homalospondylus (Upper Lias) 

 Plesiosaurus leptopleuron (Lias ?). 

 Plesiosaurus longirostris (Lias). 

 Plesiosaurus macrocephalus (Lower Lias). 

 Plesiosaurus macromus (Lias;. 

 Plesiosaurus megapleuron (Lias ?). 

 Plesiosaurus pectopleuron (Oxford Clay ?). 

 Plesiosaurus rostratus (Lower Lias). 

 Plesiosaurus subconcavus (Lias). 

 Plesiosaurus subplanus (Oxford Clay ?). 

 Plesiosaurus subtrigonus (Lower Lias). 

 Plesiosaurus trigonus (Rhaetic). 



SAURIA. 



DOLICHOSA URIDm. 



Saurospondylus dissimilis (Lower Chalk). 

 Dolichosaurus longicollis (Lower Chalk). 



IGUANID&. 



Iguana europasa (Upper Eocene). 



ANGUID&. 



Placosaurus margariticeps (Upper Eocene). 



75. Anguis fragilis (Existent), Slow Worm. 



LACERTID&. 



76. Lacerta vivipara (Existent), Viviparous Lizard. 



77. Lacerta agilis (Existent), Sand Lizard. 



78. Lacerta viridis (Existent), Green Lizard. 

 Lacerta eocena (Lower Eocene). 

 Conisaurus crassidens (Chalk). 

 Macellodus brodiei (Middle Purbeck). 



COLU BRIDIE. 



79. Tropidonotus natrix (Forest Bed and Existent), 



Ringed Snake. 



80. Coronella laevis (Existent), Smooth Snake. 



