THE DINOSAURS ~ 105 
It was then a sluggish stream with marshy 
borders, a stream subject to frequent floods, 
when the water, turbid with mud and laden 
with ‘sand, overflowed its banks, leaving them, 
as the waters subsided, covered thickly with 
mud. Here, amidst the luxuriant vegetation 
of a semi-tropical climate, lived and died the 
Iguanodons, and here the pick of the miner 
rescued them from their long entombment to 
form part of the treasures of the museum at 
Brussels. 
Like other reptiles, living and extinct, 'Thes- 
pesius was continually renewing his teeth, so 
that as fast as one tooth was worn out it was 
replaced by another, a point wherein Thespe- 
sius had a decided advantage over ourselves. 
On the other hand, as there was a reserve sup- 
ply of something like 400 teeth in the lower 
jaw alone, what an opportunity for the tooth- 
ache ! 
And then we have a multitude of lesser Di- 
nosaurs, including the active, predatory spe- 
cies with sharp claws and double-edged teeth. 
Megalosaurus, the first of the Dinosaurs to be 
really known, was one of these carnivorous 
