164 EXTINCT MONSTERS 
In that year came the good news that no less than twenty- 
three Iguanodons had been found in the colliery of Bernissart, 
in Belgium, between Mons and Tournai, near the French frontier, 
The specimens so skilfully set up by M. de Pauw represent two 
distinct species. The larger one, Iguanodon Bernissartensis, 
cannot be less than fifteen feet high, and, measured from the tip 
of the snout to the end of the tail, is rather over thirty feet long, 
ait So 
Fia, 54.—Skeleton of Igwanodon Bernissartensis. (After Dollo.) 
covering nearly twenty-four feet of ground in its erect position 
(see Fig. 54). Iguanodon Mantelli is smaller and more slender 
looking, with a height of over ten feet, and a length of about 
twenty feet. (See Fig. 55.) 
The huge three-toed impressions found in Sussex (see p. 166) 
prove that the monster, although owning a body as large as that 
of an elephant, habitually walked on its hind legs! Some of the 
thigh-bones found by Dr. Mantell measured between four and five 
