DINOSAURS 171 



name Trackodon has been given, but it is really the same genus. 

 Professor F. A. Lucas says that in some cases the impression of 

 the skin was preserved in the surrounding rock, and that it 

 appears from these that the creature was covered with small 

 horny plates. Another at Yale University is twenty-nine feet 

 long. The Natural History Museum possesses a specimen 

 showing the skin. Gallery IV., Wall-case 8. 



The late Mr. J. W. Hulke, another English authority on 

 Dinosaurs, described some twenty years ago a very remarkable 

 and slender form of Dinosaur, on which we must now, in con- 

 clusion, say a few words. Professor Huxley has also helped to 

 unravel the meaning of its structure. Hypsilophodon is the name 

 this little creature has received, on account of the nature of its teeth. 

 As far as we know it was the smallest of the Dinosaurs with the 

 exception of the Compsognathus l and Hallopus, and Scleromochlus. 

 It is certainly the least specialised that is, the least highly orga- 

 nised. It lived during the Wealden period, or, in other words, 

 during the closing scenes of the great Mesozoic era, and so was 

 contemporary with others of a much more specialised character. 

 As a rule the remains of animals found in our English Wealden 

 and Cretaceous strata are in a fragmentary condition ; but in this 

 case we have, fortunately, an exception. Almost the whole of its 

 skeleton is now known, thanks to the labours of Mr. Hulke and 

 the Rev. William Fox. The remains occur in a bed which crops 

 out a short distance west of Barns High Cliff, and passes under 

 the shore a few yards west of Cowleaze Chine, on the south 

 coast of the Isle of Wight. A restoration of its skeleton, 

 according to Hulke, is seen in Fig. 59, and in Plate XXV. we 

 have the creature restored to life. The skull shows a combina- 

 tion of characters belonging to a crocodile and a lizard, but is 

 1 Greek koinjjsos, elegant ; ynathos, jaw. 



