122 FOOTPRINTS OP A DINOSAUR. 



2, 3, 7 being Sauropoda would only make a pentadactyle print. 

 4, Scelidosauria ,, tetradactyle 



1 Theropoda ditto. 



7 Camptosauria ditto. 



5 ,, Iguanodontidse tridactyle. 



We arrive at the conclusion, therefore, that these are the foot- 

 tracks of an iguanodon as it crossed the shallows of the Purbeck 

 lake or estuary. 



The Dinosaurs have several ornithic characters ; Iguanodon 

 takes its place in the sub-order Omithopoda, which approaches a 

 bird not only in the bipedal progression but in the structure of 

 the pelvic-girdle, the ilium being prolonged both before and behind. 

 The post-pelvis lies parallel with the ischium and appears to 

 foreshadow the marsupial bones of that region in the marsupials. 

 Dinosaurs are more closely allied to birds than any reptile now 

 living. 



A splendid cast of Iguanodon Bernissartensis stands in the Fossil 

 Reptilian Gallery of the British Museum, Cromwell-road, a present 

 of the Belgian Government. Entire skeletons of the two species 

 are set up in the Vestibule of the Court of the Royal Museum, 

 Brussels, which are well worthy of a special visit. 



Since this paper was read I have secured a slab showing the 

 actual footprint of a Purbeck Dinosaur from the Upper Purbecks. 

 Mr. Hardy, of Swanage, tells me he has seen similar footprints in 

 the Lower Purbecks as well, if this is the case we have evidence 

 of Ornithichnites during the whole of the Purbeck series.' Their 

 occurrence in the Oxford and Kimmeridge Clays shows a vertical 

 range from the Middle Oolites to the Lower Cretaceous. 



