6 Prof. 0. C. Marsh — European Dinosaurs. 



specimen, I have used a dotted outline, based on the nearest allied 

 form. Of the dermal armour, only the row of plates hest known 

 is indicated. The position chosen in this Figure (PI. II) is one 

 that would be assumed by the animal in walking on all four feet, 

 and this I believe to have been its natural mode of progression. 



Hypsilophodon. (Plate III.) 



The third of these restorations, that of Hypsilophodon Foxii, 

 Huxley, 1870, given in outline, one-eighth natural size, in Plate III, 

 has been made with much care, partly from the type specimen and 

 in part from other material mostly now in the British Museum. The 

 figures and description by the late Dr. Hulke 1 were of special value, 

 although my own conclusions as to the natural position of the 

 animal when alive do not coincide with those of my honoured 

 friend, who did so much to make this genus of Dinosaurs, and 

 others, known to Science. The restoration by Dr. Hulke is shown 

 in the subjoined diagram (Fig. 2). 



Fig. 2. 



-Restoration of Hi/psilophodon Foxii, Huxley. 

 (After Hulke.) 



One-tenth natural size. 



In the case of Hypsilophodon, a number of specimens are available 

 instead of only one. This makes the problem of restoration in 

 itself a simpler matter than in Scelidosaurus. Moreover, we have 

 in America a closely allied form, Laosaurus, of which several species 

 are known. A study of the genus Laosaurus, and the restoration 

 of Hypsilophodon given on Plate III, will clear up several points 

 long in doubt. 



Huxley and Hulke both shed much light on this interesting 

 genus, Hypsilophodon; indeed, on many of the Dinosauria. The 

 mystery of the Dinosaurian pelvis, which baffled Cuvier, Mautell, 

 and Owen, was mainly solved by them — the ilium and ischium by 

 Huxley, and the pubis by Hulke. The more perfect American 

 specimens have demonstrated the correctness of nearly all their 

 conclusions. 



Iguanodon. (Plate IV.) 



The fourth restoration here given, that of Iguanodon Bernissartensis, 

 Boulenger, 1881, one-fortieth natural size, has been made in outline for 

 comparison with American forms. It is based mainly on photographs 

 1 Philosophical Transactions, 1882. 



