OF HYPSILOPHODON FOXII. 1057 
the distal half is missing, as is also the continuation of the toe, so that the number of 
phalanges it had before mutilation is unknown. The ungual phalanges of the manus 
resemble on a small scale those of the pes, as already stated. Evidently the manus of 
Hypsilophodon conforms more nearly to that of existing Lizards, its type is more 
generalised than that of the manus of Iguanodon Mantelli , which is highly specialised. 
The relative smallness of the fore limb in Hypsilophodon , shown for the manus by 
the lengths of the metapodia and phalanges already given, is evident also upon a 
comparison of the other corresponding segments of the fore and hind limb, as may be 
seen by the following numbers :— 
Table of Lengths. 
centims. 
Femur*. 15-0 
Tibia*. 15-5 
Illrd. metatarsal. 7’6 
Humerus. 9*5 
Ulna. 8‘7 
Radius. 7*8 
Illrd. metacarpal. 1*9 
Explanation' of Plates. 
Denote fossils formerly in the collection of the late Rev. Wm. Fox, recently acquired 
by the British Museum. *** Denote fossils in my own collection. Unless other¬ 
wise stated the figures represent the natural size of the fossils. 
PLATE 71. 
The following lettering applies to all the figures in this plate. 
pa. The parietal bone. 
fir. The principal frontal bone. 
prf The prsefrontal bone. 
psf. The post-frontal bone. 
nas. The nasal bone. 
nar. The anterior nares. 
pmx. The prsemaxilla. * Its median ascending process. t Its lateral 
ascending process. 
mx. The maxilla. 
* These bones are slightly mutilated and their real lengths are somewhat more. 
6 T 2 
