1018 MR. D. M. S. WATSON ON 
The first dorsal vib is a narrow, slightly bent, and quite short 
bone of an ordinary character. The remaining dorsal ribs, from 
the second to the ninth, ave of an extraordinary character. Hach 
is strongly curved, articulates by a facet on its proximal end with 
the face on the centr um, and then rises, until its upper surface 
comes in contact with the neural arch; there is no definite 
tuberculum and the capitulum is extremely feeble. The rib 
then rises above the level of the neural spine so that the dorsal 
surface of the vertebral column lies at the bottom of a groove 
formed by the proximal ends of the ribs. The rib now turns 
outwards and downwards. The ribs widen very rapidly from 
the capitulum, so that until just at the point where they turn 
downwards their lateral borders actually touch. They are of a 
massive character throughout, and each is strengthened by the 
development of a ridge along its visceral surface. 
The rib of the fenbe vertebra is not known, but was certainly 
not expanded like those which preceded it. 
The sacral rib is short and stout. 
The shoulder-girdle is well shown in 49423. In this individual 
the bones of each side have fused, forming a scapulo-coracoid 
which rather strikingly resembles that of Procolophon. The 
scapula has a fairly narrow blade with a straight anterior edge, 
which has no specialised acromion. ‘The preco‘acoid is a bone 
of triangular shape lying flat on the ventral surface. This 
results in the scapulze being set not, as usually, in planes parallel 
to the principal plane of the body, but inclining together in front, 
so that the opening between them towards the neck is very much 
narrower than that towards the dorsal region. This implies that 
the neck was narrow. 
The precoracoid apparently contributes to the glenoid cavity, 
and is pierced by a foramen which, exactly as in Pr ocolophon, is 
protected by a rounded ridge along g its front border. The 
coracoid is a small bone extr emely like that of Procolophon. 
The clavicle is a narrow bone running down the entire front 
edge of the scapula and then turning slightly in to the inter- 
clavicle. 
The interclavicle is a long slender rod with a slightly expanded 
anterior end which is covered by the inner ends of the clavicles. 
The humerus is only incompletely shown. 
The nearly complete immature bone in 49424 is badly preserved, 
but shows that the bone is narrow and suggests that the deltoid 
crest was small. 
The impressions in 49423 show that there was a definite head 
which is slightly upturned, and that there was an unusually large 
but very short ulnar crest. 
The pelvis is represented by the hadly preserved impressions 
of the anterior borders of the ilia (and pubes 2?) in’R. 4054, and a 
perfect pubis in the type. The ilia have a narrow and straight 
anterior border and are as high as the space between them. The 
