OF TILGATE FOREST. 
last is of the size and form of a small patella, and is 
composed of minute linear spicula.* of bone which 
decussate each other almost at right angles : this 
structure prevails in all the specimens : one hone of 
this kind, of an irregular form, is 2 inches in diameter. 
DERMAL BONES OF THE HYLyEOSAURUS. 
a. Dermal aspect. 
b. Surface attached to the scale. 
c. Magnified view of a part of the surface. 
There cannot exist a doubt that these are dermal 
bones to which the scales of the animal were at- 
tached. 
Such are the anatomical developements which the 
fossil skeleton before us offers for our consideration, 
and it remains to determine what place it should 
hold in the saurian family. It is unnecessary here 
to repeat the reasons which prove, that although the 
vertebral column and ribs approximate it to the 
crocodile, the sternal a])paratus shows it to be more 
nearly related to the monitors, from which it is distin- 
guished (as well as from the Megalosaurus), by the 
T I 
