182 Transactions of the South African Philosophical Society. 
Theriodont. The humerus in Ictidosuchus, like that in Therio- 
desmus, in its general proportions seems more mammal-like than 
any other of the known Theriodont humeri. The upper part of the 
humerus bears some resemblance to that in Gomphognathus, but the 
radial crest passes less directly outward from the bone than in that 
genus, and forms a deeper concavity on its inner side. As in Gom- 
phognathus, the radial crest arises rather abruptly near the middle 
of the bone, and is not continued down as in Cynodraco to strengthen 
the bridge over the entepicondylar foramen—the bone between the 
lower end of the radial crest and the upper end of the bridge being 
almost quite round. The entepicondylar foramen is fairly large, and 
is much more proximally situated than in Gomphognathus. Though 
the distal extremity is missing, from what remains it is manifest that 
there must have been a very small external condyle, though the 
internal condyle may have been moderately large. 
RADIUS. 
The radius is somewhat crushed, and the extremities not very 
perfect. In its general proportions it agrees fairly well with that in 
Theriodesmus. It is about 70 mm. in length. 
FEMUR. 
The femur is fairly well preserved, and is unlike any femur 
hitherto found. Unfortunately the head is lost; but though the 
lower part is somewhat fragmentary, the fragments can all be fitted 
in true apposition. In the middle region the femur is fairly round 
and small, but it becomes greatly expanded at each end. The upper 
end has a large trochanter major, immediately below which on the 
front of the femur is a large deep oval depression, about as wide as 
the femur is at its middle, and almost as deep as it is wide. The 
bottom of this concavity is rounded and smooth. Iam not aware of 
a similar concavity having been found previously in the femur of any 
Theriodont, but a distinct though much less marked concavity is 
found in the corresponding part of the femur of Dicynodon ; and 
among mammals a quite distinct depression below the trochanter 
major occurs in Ornithorhynchus and Kchidna. So far as the femur 
is displayed no trochanter minor is to be seen. Near the junction of 
the upper ? with the lower 2 the femur begins to expand out towards 
the distal end, and as it broadens out it becomes transversely concave. 
The axis of the lower partis also bent slightly backwards and inwards, 
so that the lower part of the femur looks slightly outwards. The 
condyles are apparently situated mainly below the outer part of the 
