742 MR. D. M. S. WATSON ON 
head is a large triangular area, obviously covered by a thick pad 
of cartilage during life. 
The anterior lower corner of the head gives rise toa ridge 
which rapidly subsides into the shaft and forms the only repre- 
sentative of the deltoid crest. 
The anterior upper corner also gives rise to a ridge which 
passes down the dorsal and anterior edge of the humerus until it 
in turn passes into the shaft. 
The posterior lower corner of the triangular head gives rise to 
a pronounced ulnar crest of much greater size than the radial 
expansion. The bone has a narrow shaft which expands into the 
wide lower end of the bone. This bears a prominent condyle for 
the head of the radius and one for the ulna. There is a large 
entepicondyle with a foramen. 
The radius and ulna present no marked features. 
The carpus and manus are exactly as Dr. Broom has already 
figured them; the radiale is unossified; in the male skeleton 
traces of its cartilage were preserved. 
Pelvic limb.—The pelvis, as shown in my specimens, is rather 
different from that of Dr. Broom’s specimen. 
The ilium is high and narrow, it is supported by the three 
sacral ribs, and placed almost vertically; it forms about a third 
of the acetabulum, above which it is thickened to form the usual 
process. 
The pubis is an extremely massive bone, nearly square when 
seen from below, and pierced by the foramen ; it articulates with 
its fellow so that the lower surfaces meet in an angle considerably 
less than two right angles; in other words, the lower surface of 
the pelvis is not flat. The upper surface of the pubis slopes 
down very rapidly in front. 
The ischia present no special features. 
The hind leg has already been well described and figured by 
Seeley and Broom; my specimens agree exactly with theirs. 
The restoration of the skeleton in a walking attitude, text- 
fig. 5, is drawn entirely from the male skeleton. 
The length of the neck depends on the actual position of the 
pectoral girdle in the specimen, which is quite undisturbed, lying 
on the ventral surface with the fore legs placed straight back 
along the body and the soles of the two feet together along the 
tail. The head is turned sharply to the right, but as every bone is 
in close and accurate articulation this position must be a possible 
one. In the female skeleton the head is in a similar position, 
and the shoulder-girdle equally far back. The tail in the 
restoration is completed from the entire series of caudals of the 
female skeleton. 
Taken as a whole Frocolophon is very lizard-like in build, 
although it is rather massively constructed. 
The male and female skeletons are of exactly the same length, 
as are their skulls. The dentition is quite similar in the two 
specimens, and I think there is not the slightest doubt that they 
