264 
PKOFESSOR H. G. SEELEY ON THE STRUCTUEE, ORGANIZATION, 
outline on the radial side. Above the radial condyle on the inferior aspect the shaft 
is oblique, concave from above downward, and becomes somewhat concave trans¬ 
versely, distally, as it approaches the condyle. On this area, at 18 centims. from the 
distal extremity of the bone, 5 or 6 centims. above the sharp proximal termination of 
the condyle, and 3‘5 centims. from the radial margin, is the supra-condylar foramen. 
It is about 1'3 centim. wide, and descends obliquely downward. A wide notch on the 
margin of the condyle towards the lateral ridge may have carried the vessel which 
issued from this foramen. The foramen is situate substantially as in Cijnodraco, 
Brithoims, and Hatteria. 
On the ulnar side, the distal part of the shaft is similarly flattened, concave from 
within outward, with a deep oblique groove facing laterally, defined by a ridge of 
bone extending over the depression. At 22 centims. from the distal end, and about 
3’5 centims. from the lateral margin, is a foramen which appears to be of the same 
size as the supra-condylar foramen on the radial side. Distally, by the side of the 
sharp Iciteral margin, above the condyle, is a moderate longitudinal groove, which may 
have carried the vessel issuing from the foramen. This foramen is present in 
Dicynodonts and is found in Hatteria. 
The proximal end of the bone is only preserved on the inferior surface. It shows 
the articular head to be well rounded and dnected inward, and defined from the radial 
side of the bone by a deep concavity which extends to the middle of the shaft. The 
extreme measurement from the head of the bone to the ulnar condyle is 45 centims. 
The radial crest is prolonged proximally far beyond the head, so that the measurement 
from the proximal border to the extremity of the radial condyle is 54 centims. In the 
transverse direction, the space between the head of the bone and the radial crest is 
concave. The proximal extremity of the radial crest is about 14 centims. in transverse 
width, convex from within outward, and well rounded on the posterior border. It is 
about 6'5 centims. thick, and is reflected downward and forward, widening the bone, 
down which it extends for more than half its length, measuring about 33 centims. in 
length. It appears to become narro\yer as it extends distally, but the distal develop¬ 
ment is imperfectly preserved. Its external or anterior surface is gently convex in 
the vertical direction, smooth, and has an unbroken concave contour from the rounded 
summit of the crest to the condyle at the distal end, where the concavity is more 
marked, and also developed transversely. 
The humerus shows some general approximation of plan to that of the giant 
Salamanders in the expansion of the extremities, the thickening of the distal end of 
the shaft, the superior concavity between the condyles, and the development of the 
radial crest. 
In Hatteria the resemblance of the contour of the humerus to that of an Anomodont 
is so close as to amount almost to identity of plan, the chief differences being that 
in Hatteria the radial crest is much less developed and that the extremities of the 
bone are less massive. 
