FISH-LIZARDS. 



Si 



stance that in the skeletons from the Lias (Fig. 22) 

 the tail is nearly always broken at some distance from 

 its extremity, it has been suggested that the tail was 

 furnished with a terminal fin, after the fashion of the 

 " flukes " of the Whales. In some instances the fine- 

 grained Lias mud has even preserved traces of the 





FIG. 23. Part of one of the fore-paddles of a small Fish-Lizard from the Lias of 

 Barrow-on-Soar. hu, bone of upper arm ; r, it, bones of fore-arm ; the other 

 letters indicate the bones of the wrist, below which are the bones of the 

 fingers. 



outer surface of the skin of the Fish-Lizards, and we 

 learn from this, and also from the absence of any traces 

 of bony plates like those found in the skin of crocodiles, 

 that the skin of these saurians was quite naked, and 

 are thus shown another feature in which they resemble 

 whales. Moreover, in certain very rare instances, as is 



F 



