AMPHIBIANS OP THE FAR PAST 63 



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

 rinthodont tooth already noted. ' 



I^IG. 32. — Trematosaurus. (After Htjxlby.) 



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 vertebratr- IrnoT-n '^■'^„i<!lf^?\ Kl-vra 

 Ganoids, shark-forms an i '''''-"^|>^I\'\*M£E 

 fishes ; and since these .ire >^^>2tsiO'SS'i< 

 known to be well sepa- J^MCS^^^r^k^ri^ 

 rated from each other ,^rwB3 i^gfc|a! §^s n!^ 

 vei^ far below the ^iS^^SEg^^BN* 

 place where any fos- ^s^SN^^^^H^t^ 

 sils of amphibians /^/j'K^^^^aS'^^ 

 are <fonnd, it is \^^J^^^^^^SSw^^^k!L 

 quite probable ^S^^^^^f^^^^'^" 

 that these latter |J^^ B^ '/iS&gg^nr^f^J^g 



branched from ^^^ 33._Section of tooth of a labyrinthodont. 



the parent back- 

 boned ancestor at about the same time that the\others 

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



