OF TILGATE FOREST. 
259 
second or third sternal plates, which exhibit the 
curvature for the passage of the paws. The marine 
turtles have the plates of the breast-plate lobed 
and dentated, and we have very recently obtained 
a fine example of the third sternal plate of a turtle, 
from Tilgate, in which the dentated margin closely 
resembles that of the Teatado imbricata^ or T. 
carinata, and of the fossil species found at Maes- 
tricht.* We have also part of a shoulder-bone, 
which is very like that figured in j)l. xiv. fig. 6. 
Ossemens Foasiles, tome v. This specimen bears 
a greater affinity to the shoulder-bones of a marine 
turtle than to those of a land or freshwater 
species. 
Our cabinet conkiins numerous other fragments 
of the caraj)ace, sternum, ribs, humerus, clavicle, 
&c., but none sufficiently perfect to throw any 
additional light upon our investigations. From 
what has been advanced, we may, however, infer, 
that the strata of Tilgate Forest contain the re- 
mains of at least three very distinct kinds of 
turtles ; viz. 
1st. A freshwater species, allied to the Trionyx. 
2dly. An unknown species of Emys^ resembling 
a fossil freshwater turtle, found in the Jura lime- 
stone. 
3dly. A marine suecies belonging to the sub- 
genus Chelonia^ and related to the fossil turtle of 
Maestricht. 
Oss. Foss., pi. xiv. fig. 3. tome v. 
