1 66 EXTINCT MONSTERS 



remains of Iguanodon at South Kensington, and also some of the 

 gigantic tracks already alluded to. A complete cast of a skeleton 

 may be seen in the reptile gallery of the Natural History 

 Museum. 



The Bernissart specimens even afford some evidence as to the 

 nature of the integument, or skin, and this supports the idea 

 previously held that the creature possessed a smooth skin, or, 

 at least, only slightly roughened. The muzzle was quite tooth- 

 less, and perhaps may have been sheathed in horn, like the beak 



FIG. 56. Tracks of Iguanodon, much reduced. From Wealden strata, Sussex. 



of turtles an arrangement highly useful for biting off the leaves 

 of trees. 



Probably it passed much of its time in the water, using its 

 immense powerful tail as an organ of propulsion. When swim- 

 ming slowly it may have used both sets of limbs, but when going 

 fast it probably fixed its fore limbs closely beside its body, and 

 drove itself through the water by means of the long hind limbs 

 alone. M. Dollo, of Brussels, is preparing a final monograph 

 on the Bernissart Iguanodons, a work to which palaeontologists 



