230 DINOSAURS OF NORTH AMERICA. 



In the present outline restoration of Scelidosaurns the writer has 

 endeavored merely to place on record his idea of the form and position 

 of the skeleton when the animal was alive, based on the remains he 

 has himself examined. In case of doubt, as, for example, in regard to 

 the front of the skull, which is wanting in the type specimen, a dotted 

 outline is used, based on the nearest allied form. Of the dermal armor, 

 only the row of plates best known is indicated. The position chosen in 

 this figure (PI. LXXXIII) is one that would be assumed by the animal 

 in walking on all four feet, and this is believed to have been its natural 

 mode of progression. 



KYPSILOPHODON. 

 Plate LXXXIV. 



The third of these restorations, that of Hypsilophodon Fo.rii Huxley, 

 187(1, given in outline one-eighth natural size on PI. LXXXIV, 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 

 the conclusions of the writer as to the natural position of the animal 

 when alive do not coincide with those of his honored friend, who did so 

 much to make this genus of dinosaurs, and others, known to science. 

 The restoration by Dr. Hulke represented the animal as quadrupedal. 



In the case of Hypsilophodon a number of specimens are available 

 instead of only one. This makes the problem of its restoration a 

 simpler matter than in Scelidosaurus. Moreover, there is in America 

 a closely allied form, Laosaurus, of which several species are known. 

 A study of the genus Laosaurus, and the restoration of one species 

 given on PI. LVII, 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, Mantell, 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. 



IGTJANODON. 



Plate LXXXV. 



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 of 

 the well-known Belgian specimens, the originals of which the writer has 

 studied with considerable care during several visits to Brussels. The 

 descriptions and figures of Dollo 2 have also been used in the prepara- 

 tion of this restoration. A few changes only have been introduced in 



1 Philosophical Transactions,1882. '' Bulletin Royal Museum of Belgium, 1882-88. 



