88 
CHELONIA FROM THE 
scutes raised instead of excavated in tlie bone. They 
cross the 1st, 3rd, 5th, and 8th neural and apparently 
the pygal plate. It is gently convex and has the outer 
border of the anterior marginal plates more than usually 
turned up. There is a nuchal scute. The first vertebral 
scute is about half as long as the second, but as wide. 
The vertebral scutes are narrow, being narrower than 
the costal scutes, which are unusually large and encroach 
upon the marginal plates. It approximates to Pleuro- 
sternon latiscutum (Owen), which is the only other spe¬ 
cies with a nuchal scute, but is readily distinguished by 
the proportions of the vertebral and costal scutes. 
5 impression of the interior of sternal plates of a ? Pleuro- 
s ter non. 
As the bones are gone, and have left sutural markings 
scarcely to be distinguished from the cracks, it is not 
very evident whether the intercalated bones of the 
plastron in Pleurosternon are present. 
6 two portions of carapace of Pleurosternon typocardium. 
7 marginal and costal plates of Pleurosternon. 
8 costal plate of Pleurosternon. 
9 costal plate of Pleurosternon. 
10 hyposternal half of the plastron of Pleurosternon, showing 
the intercalated plates. 
It approximates towards the species P. emarginatum, 
but appears to be distinct. 
11 interior of hyposternal plate of Pleurosternon. 
12 interior of hyposternal plate of Pleurosternon. 
13 scapula of a small Emydian, probably Pleurosternon. 
The remainder of the Purbeck Bepti.les are in Cabinet lxxxii. b. 
They comprise a portion of the head of Macellodus Brodiei (Owen) 
and the impression of its lower jaw; and a scute of a Crocodile, 
probably Goniopholis. 
In the same Cabinet are the lower jaw and caudal vertebra of 
Pterodactylus macrurus, and a phalange of a small Pterodactyle. 
