IG [JANODONTIDiB. 193 



Genus HYPSILOPHODON, Huxley 1 . 



Premaxilla with teeth; orbits regular, with bony plates in 

 sclerotic. Cervical vertebrae opisthocoelous ; dorsals amphicoelous 

 and moderately compressed ; sacrals somewhat compressed, rounded 

 inferiorly. Scapula distally expanded ; manus with first digit 

 normal. Ilium with long preacetabular process, and postacetabular 

 portion deep, with squared termination ; shaft of pubis com- 

 paratively broad, and as long as ischium ; ischium with hammer- 

 shaped head, and moderately long and broad shaft, which is not 

 twisted. Eemur shorter than tibia ; metatarsals long and slender ; 

 pes with four functional digits, of which the terminal digits are 

 curved and laterally compressed. Dollo (< Comptes Eendus,' vol. cvi. 

 p. 775, 1888) describes the sternum as rhomboidal, and makes this 

 genus the type of a family. 



Hypsilophodon fox!, Huxley 2 . 



Syn. Iguanodon foxi, Owen 3 . 



The type species. Usually of small size, the length of a skeleton 

 of average dimensions being about four feet. Five sacral vertebrae ; 

 inner trochanter of femur in upper third of the shaft. 



Hah. Europe (England). 



All the following specimens are from the Wealden ; and, unless it is 

 stated to the contrary, were obtained from the Isle of Wight, and 

 belong to the Fox Collection. Purchased, 1882. 



R. 196 a. The nearly entire skeleton, in a block of sandstone ; from 

 {Fig.) Cowleaze Chine, near Brixton. Eigured by Hulke in the 



' Phil. Trans/ 1882, pi. lxxii. fig. 2 (mandible), pi. lxxv. 



(vertebrse and pelvis), and pi. lxxix. figs. 2, 3 (pectoral 



limb). 



R. 196. Slab showing portions of vertebral column and of pelvic 

 girdle and limbs ; from Cowleaze Chine. 



R. 193. Hinder half of thoracic region of the vertebral column and 

 anterior half of caudal ditto, with the pelvis and right 

 hind limb. 



39460-1. Slab with the greater part of the vertebral column and 



(Fig.) some of the limb-bones ; from Cowleaze Chine. Figured 



by Owen in his ' Wealden and Purbeck lleptilia ' (Mon. 



Pal. Soc), pt. ii. pi. i. (1855), as Iguanodon; described by 



Hulke, op. cit. p. 1044, three cervical vertebrae being 



1 Quart. Journ. Geol. Soc. vol. xxvi. p. 3 (1870). 2 Loc. cit 



3 Ibid. vol. xxix. p. 531 (1873). 



