OF THE IGUANODON, AND OTHER SAURIAN REMAINS. 
143 
receiving* intelligence of the discovery I immediately repaired to the spot, it was too 
late to obtain any certain information of the manner and position in which the bones 
had been deposited. From several bushels of fragments of bones, I was enabled to 
determine that there were two omoplates identical in character, but one-third larger 
than the corresponding bones of the individual above described ; and these alone 
were sufficient to prove that the remains in question belonged to the Hylseosaurus. 
From the fragments, the following bones were restored. 
Two omoplates (Plate X. fig. 1 0.), one perfect, and exhibiting the glenoidal facet, 
and the surface to unite with the coracoid. These bones are nineteen inches long. 
One humerus (Plate X. fig. 5.) ; this bone is entire, and the radio-ulnar articulating 
facets are well shown. 
A phalangeal bone (Plate X. fig. 9.). 
Ribs or costal processes : of these a great number occur, but none are perfect, 
although many exhibit the bilobed head (Plate X. fig. 12.) and the great external 
expansion of the arch ; this modification in all probability bears a relation to the 
enormous development of the dermal spines. 
A third example of this reptile was discovered in a quarry in Tilgate Forest but 
a short time before I finally quitted Brighton in the autumn of 1837. This specimen, 
like the former, fell into the hands of the parish labourers, who had not been ap- 
prized of the increased value of the fossils if carefully removed. From the connected 
state of the vertebrae, even when first seen by me, it is certain that a much larger 
portion of the skeleton was preserved in the rock, and might by due care have been 
extricated. This relic, which is about six feet in length, consists of three portions of 
the spinal column, comprising twenty-five vertebrae, of which fifteen are caudal, and 
bear three distinct and very peculiar modifications of the haemapophyses or chevron 
bones. The transverse processes of the lumbar and dorsal vertebrae are very large 
and strong. Along the vertebral column, on each side, are several dermal bones of a 
discoidal form (Plate X. figs. 3, 4.) ; some circular, others elliptical, and varying 
from one to three inches in diameter. There are also the bases of several very large, 
angular, dermal spines (resembling Plate X. fig. 1.), and these correspond in every 
respect with those of the first specimen. Thus while the omoplate and ribs leave 
not a doubt of the generic, if not specific, relation of the two first specimens, the 
dermal bones and vertebral column afford evidence equally satisfactory that this last 
individual also belongs to the same genus. The three specimens afford the following 
osteological elements of the Hyleeosaurus : — 
Spinal column. Cervical, dorsal, arid caudal vertebrae, with the hcemapophyseal ap- 
pendages. 
Ribs or costal processes. 
Pectoral arch. The Coracoids and Omoplates. 
Anterior extremity. The humerus , radius P and one phalangeal bone. 
Dermal bones and spines. 
Teeth (?), Plate VI. figs. 9, 10, 11. 
