2o 
of sclerotic plates from the orbit. But the impression remains 
from which the circle came away, and although delicate, it 
appears to show some evidence of a radiating structure The 
pit which has held it is not now circular, but deeper than wide. 
The ej 7 e was rather behind the middle length of the head, was 
relatively large, extending between the crown of the head and 
the inferior angle of the palate. There appears to be some 
matrix in the middle of this depression. At some distance in 
front of the orbit on the side of the head, in the position 
occupied by the right anterior nostril of a plesiosaur, is a circular 
area very slightly raised, with a small central spot, which I 
regard as being situate as the nostril would have been in the 
living animal. Extending between the nostrils towards the 
orbit, there are parallel longitudinal ridges such as might 
margin two slender nasal bones, and these surfaces appear to 
be truncated posteriorly in a line with the middle of the orbit, 
as though the frontal bones there joined the nasal bones. There 
is some appearance of the parietal foramen, though in the 
present state of preservation it is not possible to identify it. 
The side of the head has a nearly straight palatal margin 
behind the orbit, and as this is inclined, a little outward and 
downward, it gives the head the appearance of being deeper 
as well as wider than the neck behind it. 
The neck is a quarter of an inch wide at its inferior border 
behind the head, but it is not more than ^ths of an inch deep. 
Its two sides are inclined to each other, and convex, meeting 
superiorly in the median ridge already described, which is 
sharper in the front of the neck than where the neck joins the 
body. The neck is convex on the sides, and on the left side, 
on which the preservation is better, there appears to be a 
lateral angle such as might result from the position of the 
cervical ribs. The width of the neck towards its junction with 
the transversely expanded body is \ an inch, but its depth 
appears to be somewhat less. The external surface is smooth. 
There are many transverse delicate lines upon its surface. 
The neck is nearly straight, showing a slight convexity at its 
lower third such as in a plesiosaur might result from a group 
of neural spines in that position being slightly elongated. 
