906 PRINCIPAL SIR WILLIAM TURNER ON 
The height of the 1st from the ventral surface to the free end of the spine was one foot 
9 inches, that of the 14th was 2 feet 43 inches; the breadth of the 1st between the 
free ends of the transverse processes was 2 feet 44 inches, that of the 14th was 3 feet 
34 inches. The transverse diameter of the body of the 1st was 104 inches, that of the 
14th was 12 inches; the vertical diameter of the body of the 1st was 9 inches, that of 
the 14th was 94 inches. The length collectively of the bodies of the dorsal vertebre, 
measured in a straight line, was 7 feet. 
Lumbo-caudal Region.—Thirty-five vertebrae were present between the last dorsal 
and the terminal caudal. Of these, I regard the 22nd to the 33rd, both inclusive, twelve 
in number, as Lumbar, although the 33rd had an indication of an articulation for a 
chevron bone at the posterior border of its ventral surface. ‘The lumbars were the 
largest vertebree (fig. 8), and if we take the 7th as a type of the series, its height 
from the ventral surface to the free end of the spine was 2 feet 5 inches, and its breadth 
between the free ends of the transverse processes was 3 feet 53 inches; the transverse - 
diameter of the body was 12% inches, and its vertical diameter was 11 inches. The 
spines in the series were flattened laterally and usually truncated at the free ends, but 
in the 11th and 12th they tapered a little. The transverse processes, flattened from 
above downwards, projected in the middle part of the region about 15 inches from the 
body. The anterior articular processes, strong and flattened laterally, projected forwards 
and upwards. The ventral surfaces of the bodies from the 3rd to the 11th had a mesial 
antero-posterior ridge. The length of the collective lumbar bodies, measured in a 
straight line, was 8 feet 2 inches. 
The Caudal vertebree were twenty-three in number. The anterior eleven possessed 
spines, and eight of these had also transverse processes, which like the spines diminished 
in projection and size from before backwards. The vertebree which followed the above, 
representing only the bodies, were flattened on the anterior and posterior surfaces, were 
circular in outline, and the largest resembled in form curling-stones without a handle 
(Plate II. fig. 9). They gradually diminished in size, the most anterior was 
10 inches in diameter, the last two were fused with each other, the penultimate was 
2% inches by 24 inches, the last was a nodule 14 inch broad at its base, but tapered 
to a point behind; from its appearance and size no other bone had been posterior 
to it. The 5th and the succeeding caudals with transverse processes were pierced 
by a vertica] foramen at the root of each process, whilst in those still more posterior 
each side of the body was perforated by a vertical canal as far as the third from 
the end. The length of the caudal bodies, measured in a straight line, was 10 feet 
4 inches. 
Chevron Bones.—Judging from the articular surfaces visible on the ventral aspect 
of the bodies of the caudal vertebree, eleven or twelve chevron bones had been present, 
and of these ten had been preserved. In eight the two originally distinct lateral plates 
had fused together to form a mesial ventral spine, which enclosed the caudal vascular 
canal. The upper ends of these plates were thickened and articulated with their 
