jDINOSA UJIS. 
T03 
these unarmoured Dinosaurs were molested and preyed upon by 
their carnivorous contemporaries, such as the fierce Megalo- 
saurus, previously described (p. 76). And with regard to this, Mr. 
Dollo makes the suggestion that, when on land, their great height 
and erect posture enabled them to descry such enemies a long 
way olf. Their great height must also have stood them in good 
stead, by enabling them easily to reach the leaves of trees, tree- 
ferns, cycads, and other forms of vegetable life, which constituted 
their daily food. (See restorations, Plates VII. and VIII.) 
Should the reader visit the “ geological island” in the grounds 
of the Crystal Palace, he will see that Mr. Waterhouse Hawkins’s 
great model Iguanodon there set up is by no means in accord- 
ance with the description given above ; but we must remember 
how imperfect was the material at his command. 
Another Dinosaur, of considerable dimensions, that flourished 
during the Wealden period was the Hylseosaurus, also discovered 
by Dr. Mantell, and so named by him because it came from the 
Weald.^ In the summer of 1832, upon visiting a quarry in 
Tilgate Forest, which had yielded many organic remains, he 
perceived in some fragments of a large mass of stone which had 
recently been broken up and thrown in the roadside, traces of 
numerous pieces of bone. With great care he cemented together 
and fixed in a stout frame, all the portions of this block that he 
could find, and set to work to “ develop ” the block with his 
chisel. This work occupied many weeks, but his labour was 
rewarded by the discovery of certain new and remarkable features 
displayed by this monster j for it must have presented, when alive, 
a formidable array of bony plates and long sharp spines, the 
latter of which probably stood in bristling array along the back 
and tail, and other parts of the body. (Wall-case 4.) Of the 
spines no less than ten were found in this block, varying in 
length from five to seventeen inches, the largest being four 
inches thick. It is known that many lizards, such as Iguanas 
^ From wood, or weald ; and sauros^ lizard. 
