CAMBRIDGE UPPER GREENSAND, 
63 
Case. Shelf. 
X e 
e 
e 
e 
e 
e 
No. 
1 
2 
3 
4 
5—12 
13—14 
Part of the bone forming the outer sur¬ 
face of the lower jaw, apparently the 
dentary bone. The elevated ridge on the 
lower half of the inner side makes the 
bottom of the socket-groove for the teeth. 
A tooth with crown and part of one side 
worn down with use in the animal’s life¬ 
time. 
Part of the pre-maxillary bones of a large 
Ichthyosaurus, presented by the Pev. T. G. 
Bonney, M. A. The transverse section above 
the teeth is semi-circular; a deep groove 
l'uns along each side at about the line of 
the base of the fangs, dividing the lower 
third from the remainder of the bone. 
The palatal surface, as usual, rises high 
above the outer alveolar border; it is 
deeply grooved mesially, and the two 
halves of the palate are convex. The in¬ 
terspace between the upper and lower 
jaws, as fossilized, is little more than an 
eighth of an inch. 
Left pre-maxillary bone of a small Ichthy¬ 
osaurus with a narrow palate. 
Small teeth, worn while in use in the jaws. 
? ilium. 
X f 1—14 Humerus. Nos. f. 1—6 are examples of 
right humerus. Nos. f. 7—14 are left 
humerus. The head of the humerus is 
massive, oblong and rounded with a tro- 
chanteroid process descending forward half 
way down the short contracted shaft, from 
the superior posterior angle, and similar 
trochanteroid processes project from both 
the inferior lateral angles. The under 
side of the bone is concave. The distal 
end is ovate, or an elongated oblong, much 
