766 MR. D. M. S. WATSON ON 
shaft is relatively slender but very short, and soon expands into 
the broad distal end. This is furnished with two articulating 
faces: one almost entirely represented by a low knob on the 
anterior face of the bone for the radius, the other on the end for 
the sigmoidal fossa of the ulna. There is a large entepicondyle, 
and a foramen piercing the shaft just at the end of the deltoid 
crest. 
The ulna is a short massive bone, with a pronounced olecranon 
process and a facet for the head of the radius. 
The pelvis of Phocosawrus (text-fig. 13) has already been de- 
scribed by Seeley, and its general character will be best under- 
stood from the figures of this paper. The interesting features 
are the small pubic foramen, the absence of any obturator foramen, 
and the enormous size of the acetabulum. 
The four sacral ribs articulate with the inner surface by large 
facets, which are continuous with one another. 
Text-figure 14. 
Left femur of the type of Prigalion oweni, X1. R. 3596. 
The femur (text-fig. 14) is a very large bone with a rounded 
head and long and large external trochanteric ridge, which slowly 
subsides on to the shaft. The lower end is provided with two 
condyles, which are only obscurely separated from one another. 
The bone as a whole is flattened dorso-ventrally. 
The tibia is a bone with very few features ; it has an expanded 
head and a short, thick shaft. 
