REPTILES OF THE CHALK. 
153 
JAW OI<’ A REI’TII.E. 
observable in many kinds of fishes. The structure 
of a vertebra found with the jaw is decidedly that 
of a fish, the conical cavities being very deep ; and 
it possesses the annular markings so constantly ob- 
servable in the vertebrae of fishes. A cylindrical 
bone was also found, but was too much injured to 
allow of any correct inference being drawn from it. 
The posterior extremities of a lower jaw of a reptile 
were found in the same block of chalk, with por- 
tions of the upper and lower maxillae bearing many 
teeth, and corresponding with those of the last men- 
tioned fossil ; and fragments of other maxillae have 
since been discovered : the materials at present in 
my possession are, however, too imperfect to admit 
of the zoological relations of these remains being 
accurately determined. 
