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MEMOIRS OF TUE QUEENSLAND MUSEUM. 
upper part of the centrum. The great differences in the size of the pleurocoeles 
shows that B was not consecutive with A in the vertebral series, but it is 
considered that they were not widely separated. 
On the lower surface the peripheral walls are incomplete. In section 
the contours are broadly convex, but medially there is a shallow depression 
running longitudinally along the centrum. 
The dimensions of Specimen B are: — Maximum length Ilf inches (299 
mm.) ; transverse diameter 12] inches (306 mm.) ; height 12] inches (303 mm.). 
Judging from the proportions of the parts preserved, this vertebra was 
distinctly shorter than those represented in Specimen A, but was much more 
massive transversely. 
Specimen C consists of the massive rim of a “ cup ” shorn from a 
centrum and cemented with matrix to the associated “ ball.” On the lower 
surface, portions of the external walls are preserved, although greatly crushed, 
but otherwise the cortical bone has entirely disappeared. On the right side 
an oval mass of matrix (60 mm. x 25 mm.) is seen obliquely situated deep 
in the body of the matrix, denoting the inner part of a pleuroccele. Near 
the border of the “ cup,” midway between the inferior and superior margins 
of the centrum, an additional oval mass of matrix is seen on one side. This 
matrix, which is a small oval vertically placed, apparently represents an 
additional pleurocoele, much smaller (diameters approximately 40 x 20 mm.) 
and quite separate from the larger lateral cavity. 
Specimen C has been subjected to great vertical pressure, and the 
cylinder of matrix repiresenting the neural canal has been crushed down into 
the cancellous tissue of the centrum. The expanded rim, although cracked, 
has not suffered so much as the median portions, but the transverse diameter 
is probably somewhat enlarged by intense pressure during fossilisation. 
Specimen C is relatively massive in comparison with the other fragments. 
Its transverse diameter is no less than 13] inches (336 mm.), The maximum 
length is Ilf inches (299 mm. — and the height of the specimen as preserved 
is 9 inches (229 mm.). 
The predominance of the transverse diameter over the vertical diameter — 
quite apart from the distortion owing to pressure — suggests that the two 
vertebrae represented came from near the sacral region. 
Although very incomplete, these specimens definitely show that this 
Queensland Cretaceous Dinosaur exhibits in its dorsal series of vertebrae the 
variability which is characteristic of most of the Sauropoda. 
