66 Proceedings of Eoyal Society of Eclinhurgh. [sess. 
ribs which gave indications of a capitular process projecting inwards 
towards the side of the body ; but it was so feeble as to be little 
more than a mere tubercle, though it was somewhat longer in the 
2nd than in the 3rd rib. The 1st pair were the broadest and shortest 
ribs ; the length along the outer curvature was 2 feet 1 1 inches. 
The last rib, again, was the most slender, and its length was 3 feet 
5|- inches. The 4th and 5th ribs were the longest, and their 
corresponding diameters were 5 feet IJ inches. 
The sternum had the shape of a Latin cross, characteristic of the 
species. In the Granton specimen it was 19 J inches long by 
9 inches in transverse diameter. In the Dunbar specimen it was 
19 J by lOf inches. In both these adults the posterior limb was 
long and slender (in the one llj, in the other lOJ inches) ; whilst 
the anterior and lateral limbs were shorter and together rather 
trefoil-shaped. In the natural skeleton of Knox’s young animal, 
the 1st pair of ribs were seen to be joined to the posterior border 
of the transverse limbs and the anterior part of the side of the 
posterior limb. In the same skeleton the 2nd pair of ribs were 
joined together mesially and ventrally by what seemed to be a dried 
bar of cartilage, and a similar arrangement connected the ventral 
ends of the 3rd pair of ribs. 
The lumbar vertebrae in the Granton specimen were thirteen in 
number. The keel of the 13 th was prominent, and broadened out at 
its posterior end into a somewhat flattened triangular area, but as there 
was not distinct evidence of an articulation for a chevron bone I have 
included it in the lumbar series. It is possible that the 1st chevron 
bone may have been lost and too small to produce a definite 
articular area on its vertebra, and yet to have belonged to this bone, 
which would then be the 1st caudal and not a lumbar vertebra. 
The bodies of all the lumbar vertebrae were antero-posteriorly elon- 
gated and keeled. The spines were long and massive, and the 
transverse processes broad and flattened. The 6th lumbar had the 
following dimensions : — Yertical diameter of vertebra, 20 J inches ; 
body, antero-posterior diameter, 6| inches, vertical diameter, 5J 
inches; spine, length, 14| inches, antero-posterior diameter, 
inches ; transverse process, length, 9| inches, breadth, inches. 
The caudal vertebrae, nineteen in number in the Granton specimen, 
consisted of two groups, nine of which had chevron bones, whilst 
