324 NEWLY DISCOVERED FOSSIL REPTILE 
knowledged, is a question exceedingly embarrassing. 
They are evidently apophyses, and their number is 
so considerable as to suggest at once, that if they 
were attached to other bones, it must have been to 
some part of the vertebral column ; yet they can 
be neither spinous nor transverse processes, for we 
have examples of both of these still attached to the 
vertebrm, and besides, some of these bones are so 
large that none of the vertebrae could support them. 
At first I supposed them to be chevron hones or 
inferior spinous processes ; and, as above remarked, 
the detached bone at ^, Plate V. has a hollow, now 
filled with stone, as if for attachment to a vertebra ; 
but they differ most essentially from all the other 
chevron bones of the Tilgate strata, as will appear 
at once if reference be made to what has already 
been stated respecting those of the Iguanodon and 
Crocodile. They cannot have been supplementary 
transverse processes to the cervical vertebrae, (as in 
the Crocodile,) for they are both too numerous and 
too large. Upon taking the dimensions of their 
bases, it appears that the united length of the whole 
is four feet. It is therefore evident that if they 
belonged to the vertebral column, it must have been 
to the vertebrae of the tail ; but then this difficulty 
arises, that not even the large vertebrae which we 
have ascribed to the Iguanodon have such enormous 
processes ; for the base of some of these is 72 inches 
wide. Now the whole length of the five dorsid and 
two cervical vertebrae in the fossil is 17^ inches ; 
and of the whole series of fourteen vertebrae but 
3 feet. The same number of corresponding ver- 
tebrae constitute in the Crocodile about one-sixth 
