APPENDIX. 
20. 
The articular faces are both slightly concave, as- are the lateral, faces which 
are separated by the lateral ridge. 
In. 
Li 
Length of centrum, 
4i 
0 
“ “ basis neural arch, 
2 
9 
Width posterior articular face, 
4 
Depth do. medially, 
2' 
8 
“ “ laterally, 
o. 
o> 
3 
“ basis neural spine;- 
12 
Transverse diameter neural canal behind, 
10 
Width between latero-inferior ridges, 
1 
9 
“ vertical, of face of zygapopliyses, 
11 
There is a 1 light lugose protuberance in the position of the diapophysis. 
The peculiarities of this vertebra indicate most strikingly the generic 
distinctness of this great reptile from the Hadrosaurus, It is true it pre- 
sents some similarity in form to the terminal caudals of that genus, and if 
it could be referred to that portion of the series, would indicate merely 
another and larger species of Hadrosaurus. It differs in form from these- 
vertebrae, in its depressed instead of compressed form, and its lateiai angu- 
lation. That it belongs to a more anterior position in the tail is evident 
from the very large size ot the basis of the neural spine, and general greater, 
development of the neural arch and zygapopliyses, and the trace of dia- 
pophysis. Further, it is over lour times the size of the terminal caudal,, 
of IT. foulkei, while the remaining elemements do not indicate any such 
extraordinary dimensions. A position a little behind the middle of the 
series would relate well to the other proportions. 
A worn bone found with the metatarsus, has the proportions of some of 
the dermal bones ot certain Dinosauria Its large size is appropriate to 
the present species. Its base is flat with rounded outlines, and does not 
exhibit any superficial dense layer; the texture ot the interior bone is 
rather dense. The mass of the bone rises as a short thick cone turned 
abruptly to one side, the middle and apex strongly compressed, so much 
bo that the section presents an acute angle on that .side to which the apex 
curves. The bone is not entirely symmetrical, one side near the posterior 
keel being more concave than the other. The structure of the bone is 
rather dense. Its exact posoition is somewhat uncertain. 
In. 
Diameter at base, 3 
Greatest height (apex broken), 2 5 
This is another of those remarable forms which the reptilian type deveF 
oped in past ages. That it was herbivorous, and relied less on its tail for 
