Dragons of Sea and Air 



fast as a tooth is worn out it is replaced by an 

 other, tooth after tooth being pushed up from 

 below. In Thespesius the teeth were arranged 

 in a mosaic pattern, and either half of the lower 

 jaw contained something like 400 teeth. It 

 may have been an ancestor of this creature that 

 made some of the tracks in the Connecticut 

 Valley, for the tracks of the European iguano- 

 dons have been found showing the very wrin- 

 kles of the skin. 



Imagine a score of these animals stalking 

 along the shore at Atlantic City — and they lived 

 near by — what a feature they would form in 

 the landscape ! And to think that puny man 

 could lay one of these monsters low with a 

 single shot from a 30.30 rifle — what a triumph 

 of mind over matter ! 



The most complete examples of this family 

 have come from Converse County, Wyo., but 

 incomplete individuals have been found in New 

 Jersey and in Mississippi. From the manner 

 in which this last-mentioned specimen occurred 

 — in a marine deposit in company with oyster- 

 shells — it seems probable that it had been 



L>07 



