AMPHIBIANS OP THE FAR PAST 



63 



apart then as now. Fig. 33 is a cut of the true laby- 

 rinthodont tooth ah-eadj noted. 



Fig. S2.—Tfematosaurns. (After Huxley.) 



In the Triassic age the frogs appear, and we won- 

 der what it was that made the amphibians lose their 

 wrinkled teeth, set in the bones of the jaw, and 

 allowed the reptile only to bring these on up to the 

 present time. 



Professor Huxley remarks that since amphibians 

 seem to possess characters which belong to each of 

 the groups of vertebrates known as 

 Ganoids, shark-forms and lung 

 fishes ; and since these are y^ , ' t a^: 7: 

 known to be well sepa- 

 rated from each other 

 very far below the 

 place where any fos- 

 sils of amphibians 

 are found, it is 

 quite probable 

 that these latter 

 branched from 

 the parent back- 

 boned ancestor at about the same time that the others 

 did, and hence are very ancient. To the author it 



Softiou of toutli of a labyrinthodont. 



