102 



EXTINCT MONSTERS. 



at South Kensington, and also some of the gigantic tracks already 

 alluded to. (Gallery IV. on plan, Wall-cases 5 and 6 ; and 

 Gallery XL, Wall-case 7.) 



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 

 of turtles an arrangement highly useful for biting off the leaves of 

 trees. 



FIG. 23. Tracks of Iguanodon^ much reduced. 



Sussex.) 



(From Wealden strata, 



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

 immense powerful tail as an organ of propulsion. When 

 swimming 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. Mr. Dollo, of Brussels, is preparing a final mono- 

 graph on the Bernissart Iguanodons, a work to which palaeontolo- 

 gists eagerly look forward. There cannot be much doubt that 



