DIVISIONS OF EEPTILIA. 



Order VIII. Anomodontia. 



This order lias been founded for the reception of a number of fossil Reptiles 

 belonging to the period of the New Eed Sandstone, all of which seem to have 

 been adapted for walking upon the dry land. They were either destitute of 

 teeth — in which case the jaws seem to have constituted a beak, like that of a 

 Turtle— or they possessed two great tusk-like teeth in the upper jaw (as is the 

 case in IHcynodon). 



Order IX. Deinosauria. 



The Reptiles of this order resemble the preceding in being adapted for walk- 

 ing upon the dry land ; and they are confined to the Secondary period of geolo- 

 gists. They were mostly of large size, and the structure of the hind-limb is in 

 some respects singularly similar to the conformation of the same part in the 

 great wingless birds, such as the Ostrich (Cwsores). The fore-limbs are in 

 many instances so small, that these extinct Reptiles nuist have walked upon 

 their hind-legs alone. The teeth are mostly adapted for an animal diet ; but 

 in some cases the animal must have lived upon vegetable food. The most 

 important groups comprised in this order are Iguanodon, Mef/ahsawufij and 

 ffadrosaurus. 



Order X. Theriodontia. 



This order has been recently established by Professor Owen for the reception 

 of a number of extinct Reptiles from the New Red Sandstone. They present 

 some singular resemblances to the ordinary Beasts of Prey {Carnivora), tljis 

 resemblance being especially seen in the fact that their teeth were arranged 

 in three distinct sets — incisors, canines, and molars ; and the canine teeth were 

 of large size and pointed, adapting their possessors for a predaceous and car- 

 nivorous mode of life. 



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