CHAPTER III. 



PART V. 

 THE IGUANODOK 



DINOSAURIAN REPTILES IGUANODON DISCOVERY OP THE TEETH OP THE 

 IGUANODON THE IGUANA LOWER JAW OF REPTILES CHARACTER OP THE 

 TEETH OP THE IGUANODON LOWER JAW OP THE IGUANODON TYMPANIC 



BONE VERTEBRA RIBS CLAVICLE CORACOID SCAPULA STERNUM 



PELVIS SACRUM ILIUM ISCHIUM PUBIS FEMUR TIBIA FIBULA 

 TARSALS METATARSALS AND PHALANGEALS UNGUEALS HUMERUS ME- 

 TACARPALS AND PHALANGEALS DERMAL BONES QUARRY NEAR MAID- 

 STONE MAIDSTONE IGUANODON PHYSIOLOGICAL INFERENCES CONCLUDING 

 REMARKS. 



DINOSAUEIAN REPTILES. We return from our geological 

 excursion to the Wealds of Sussex, and the quarries of 

 Tilgate Forest, whence the greater part of the fossil remains 

 we have next to examine were collected, and resume our 

 review of the contents of the wall-cases in Room III. ; some 

 of which engaged our attention in the previous divisions of 

 this chapter. 



The gigantic extinct reptiles included in the genera Megalo- 

 saurus, Iguanodon, Hylseosaurus, and Pelorosaurus, cliffer so 

 essentially in their organization from all other oviparous 

 quadrupeds, as to constitute a distinct tribe or order, to 

 which the name Dinosaurian has been assigned by Professor 

 Owen a term expressive of the stupendous magnitude and 

 extraordinary structure of these remarkable saurians. 

 The characters of this order are denned as follows : 

 " This group, which includes at least three l well esta- 

 blished genera, is characterized by a large sacrum, composed 



1 It will be seen in the sequel that there are Jive, if not six, genera of 

 Wealden reptiles, with a similar construction of the sacrum. 



