ii2 EXTINCT MONSTERS 



of carnivorous mammals ; for the incisors are separated from the 

 molars by well-developed canines, and the canines of the lower 

 jaw crossed those of the upper in front. In some of the members 

 of this family the upper canine teeth are long and trenchant, and 

 the incisors large and close together. Visitors to the Natural 

 History Museum will find a most valuable set of specimens of the 

 skulls, etc. (Gallery IV.). 



In most reptiles, living and extinct, the teeth that are worn 

 away by use, or otherwise lost, are replaced by others that are 

 constantly forming in the jaws ; but in the case of Theriodonts 

 there is no evidence of preceding teeth, like the milk-teeth in 



FIG. 31. Right side-view of skull and mandible of a Theriodont (JElurosaurus 



felinus), natural size, with two upper teeth, natural size (a, b), from the Triassic 



Karoo Formation of Beaufort West, Cape Colony. Behind the large orbit the 



back part of the skull is broken away. (After Owen.) 



mammals, nor of succeeding teeth, like the crocodile's. Sir E. 

 Owen therefore concluded that these creatures had but one set of 

 teeth, which lasted through life. He has described eleven genera, 

 varying in the size and form of the skull and teeth ; they are all 

 from South Africa, and are figured in his Catalogue of the Fossil 

 Eeptiles of South Africa. 



The work of describing and classifying Anomodont reptiles has 



