FOOTMARKS IN THE SANDSTONES OF CUMMINGSTONE III 
which I am acquainted, whether mesozoic, cainozoic, or recent, is 
almost elliptical in outline, and the long axis of the ellipse, which is 
nearly parallel with the middle line, is to the short transverse axis 
as 6 to about 4. The articular surface for the humerus is crushed 
and partly broken away, and a part of the anterior external edge is 
incomplete. The posterior edge of the bone presents a deep ex- 
cavation close to the articular end; and, if two lines were drawn, 
one longitudinally through the deepest part of the notch, and the 
other transversely through the greatest transverse diameter of the 
bone, they would cut one another in the midst of a circular foramen, 
which corresponds with the coracoid foramen of Crocodiles and 
many Lizards. I find no coracoid so similar to this as that of 
fypleosaurus# 
Jaw and Teeth—The only remaining fossil which bears strongly 
upon the question of the affinities of Szagonolepis is the impression 
of a fragment of what I conceive to be the lower jaw, exhibiting the 
remains of some eight or nine alveoli. The impressions of the teeth 
contained in four of these, situated near the anterior end of the 
fragment (which may or may not have been its natural termination), 
are tolerably perfect. The third tooth is the largest, though, 
judging by its alveolus, the fourth, which is wanting, must have 
been larger than even the third. The second tooth is emerging 
from the jaw, not more than half its length being visible beyond the 
alveolar edge. 
The impression of the surface of the jaw is, though imperfect, an 
inch and a half deep in some places, while the longest tooth projects 
two and a quarter inches beyond the alveolar margin; so that this 
tooth was probably at least three inches long, while its greatest 
transverse diameter amounts to very little less than five-eighths of 
an inch. 
The upper third of each tooth is slightly recurved, and the apex 
appears to have been lancet-shaped when young, but more obtuse 
and rounded afterwards. At the apex and for some distance below 
it (half an inch in the longest or fourth tooth) the surface of the 
tooth is smooth and polished, but further down numerous longi- 
tudinal ridges, with rounded surfaces, separated by very narrow 
grooves, make their appearance, and increase slightly in strength 
down to the alveolar margin. As might be expected from the sub- 
cylindrical figure of the tooth, the ridges do not increase in width 
towards its root. 
The teeth appear to have had broad anterior and narrow posterior 
1 See concluding Note, p. 117. 
