and thus represents a primitive type. Carnivores have two 

 sacral vertabra ; man, five ; birds, ten - fifteen. Snakes show 

 the maximum maker of vertebra attaining as high as five 

 hundred. Turtles exhibit the minimum with thirty. 



CLASSIFICATION OF 

 FOSSIL REPTILES 



Index to 

 Stratigraphic Range 



Order I. 

 RHYNCHOCEPHALIA. (Extinct and living primitive 

 lizard-like reptiles.) 

 Sub-order 1. 

 Proterosauria. 



Palaeohatterus. Lower Permian. 

 Sub-order 2. 



COTYLOSAURIA. 



Nothodon (Diadectes) Permian. 



Limnoscelis. Permian. 



Seymouria. Permian. 

 Sub-order 3. 

 Pelycosauria. 



Dimetrodon. Permian. 



Naosaurus. Permian. 



Edaphosaurus. Permian. 



Casea. Permian. 



Mesosaurus. Karoo-Mesozoic. 

 Sub-order 4. 

 Rhynchocephalia Vera. 



Mesosaurus. Karoo-Mesozoic. 



Sphenodon. Triassic to Recent. 



Order II. 



SQUAMATA. (Extinct reptiles, lizards and snakes.) 

 Sub-order 1. 



DOLICHOSAURIA. 



Dolichosaurus. Upper Cretaceous. 

 Sub-order 2. 

 Pythonomorpha. 



Platecarpus. Upper Cretaceous. 

 Mosasaurus. Upper Crateceous. 

 Sub-order 3. 



—9— 



