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surface, receiving the head of the rib, is a deep pit : these are two 
peculiarities which do not exist in the known crocodiles. In the place, 
also, of the single inferior spinous apophysis, which exists in the known 
crocodiles, there are two ridges, each terminating in a tubercle placed 
forwards. The body of these fossil vertebrae is also more contracted 
in its middle than is that of the vertebrae of the common crocodile. 
The other series of vertebrae also appeared to belong to a crocodile, 
different from those which now exist, as well as from that whose ver- 
tebrae have just been described. Their characteristic differences are : 
their body is not contracted in the middle, and their transverse apo- 
physes do not arise from the reunion of several projecting ridges. 
They, therefore, resemble those of the living crocodiles much more 
than the preceding : but their principal difference, distinguishing them 
from the preceding fossil vertebrae, as well as from those of the living 
crocodiles, is that the faces of their bodies are neither of them convex ; 
but are both slightly concave. In other respects, in the disposition of 
their apophyses, in the suture which connects the annular part and 
processes with the body of the vertebrae, &c. they agree with the ver- 
tebrae of crocodiles in general. A vertebra belonging to this species 
is represented Plate XVIII. Fig. 5, which answers to the second dorsal 
vertebra of the common crocodile, by the position of its costal pit 
a, h ; but differs from it in having no inferior spinous apophysis. 
It is undoubtedly exceedingly desirable, to determine to which of 
these two systems of vertebrae, the fragments of the head and jaws 
just described may be referred. This is however, at present, hardly 
possible, the specimens which have been hitherto described not having 
been found under circumstances which would allow of determining 
the connection. M. Cuvier, however, thinks it most probable, that 
the nearly complete jaw belonged to the same animal to which the 
first described vertebrae belonged ; and that the fragment of the jaw 
which seems to approach nearer to that of the Gavial might be placed 
with the second species of vertebrae. It must be however observed, 
