Dinosauria. 
PLATE 41. 
Caudal vertebræ of the Hylæosaurus, one sixth nat. size. 
1. Ten vertebre from the base of the tail. 
2. Eleven vertebre from near the end of the tail. 
3. Under view of anterior caudal vertebre, showing the form, and place of articula- 
tion, of the hæmapophyses. 
4. Back view of a heemal arch from the same (4) region of the tail (half nat. size). 
4’. Under view of middle caudal vertebre, showing the shape of the hemapophyses, ۰ 
Side view of a hæmal arch from a middle caudal vertebra (half nat. size). 
Under view of caudal vertebrae beyond the middle of the tail. 
Back view of a hæmal arch from one of these vertebræ (half nat. size). 
“IS a 
The further modification of the heemapophyses in the posterior caudal vertebre 
is shown in fig. 2. 
From the Wealden of Tilgate, Sussex. In the British Museum. 
