VERTEBRATA: REPTILIA. 



563 



genus, also from the Muschelkalk, and is characterised by the 

 extraordinary form of the teeth, which resembled those of 

 many fishes in forming broad crushing plates, constituting a 

 kind of pavement. 



ORDER VII. ANOMODONTIA, Owen ( = Dicynodontia, Hux- 

 ley). The leading characters of this order are to be found in 

 the structure of the jaws, which appear to have been sheathed 

 in horn so as to constitute a kind of beak, very like that of 

 the Chelonians. In the genus Oudenodon (fig. 316), both jaws 



Fig. 316. A, Skull of Dicynodon lacerticeps, showing the maxillary tusk. B, Skull 

 of Oudenodon Bainii. From the Trias of South Africa. (After Owen. ) 



seem to have been altogether destitute of teeth ; but in Dicy- 

 nodon (fig. 316) there were two long tusks, growing from per- 

 sistent pulps, placed one on each side in the upper jaw. The 

 pectoral and pelvic arches were very strong, and the limbs were 

 well developed and fitted for walking, and not for swimming. 



Dicynodon and Oudenodon are known only from strata of 

 supposed Triassic age in South Africa and India, but Rhyncho- 

 saurus occurs in the Trias of Europe. This last genus, how- 

 ever, is placed by Huxley amongst the Lacertilia. 



ORDER VIII. PTEROSAURIA (Ornithosauria, Seeley). This 

 order includes a group of extraordinary flying Reptiles, all be- 

 longing to the Mesozoic epoch, and exhibiting in many respects 



