THE REPTILES OF THE KARROO FORMATION 257 



is very imperfectly known. Perhaps the most interest- 

 ing Stormberg fossil is the genus Notochampsa. This is 

 a small narrow-snouted crocodile about two feet in length 

 with rather long slender legs. The back is protected by 

 two rows of large scutes. Though apparently a land 

 animal in the main, its nearest affinity is with the Euro- 

 pean Liassic genus Pelayosaurus. Another very interest- 

 ing animal which is believed to have been found in 

 Stormberg beds is Tritylodon. This was an animal pro- 

 bably about the size of a fox-terrier, and is remarkable in 

 having a row of molars and premolars formed by a 

 series of pyramidal cusps arranged in three series, and 

 in front a pair of large incisors. Owen described the 

 form as a mammal, an opinion which has been supported 

 by Cope and the writer. Seeley, however, believed the 

 form to be a reptile. 



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