Dinosauria. 
PLATE 40. 
The osseous basis of a dermo-neural spine of the Hylæosaurus. 
p y 
Fig. 
1. A section, highly magnified, of the osseous tissue. 
2. Hinder border of the spine (reversed). 
3. Side view of the spine. 
From the Wealden of Tilgate Forest, Sussex. 
In the British Museum. 
