426 MR. ST. GEORGE MIVART ON THE 
The defect of ossification in the neural arch is very small and behind the diapophysis 
(fig. 61, 9). 
The diapophysis (figs. 59 & 61, d°) is much larger, more expanded dorso-ventrally, and 
is connected with the root of the spinous process by a ridge ; it projects outwards and 
dorsad and very slightly postaxiad. 
The neural lamina is scarcely notched behind for the spinal nerves; and the post- 
vertebral interspace is less than in the two preceding vertebre. 
The capitulum is again united by suture, but is supported more by the preaxial 
parapophysial surface of its own centrum than by the postaxial central projection of the 
thirty-sixth vertebra (fig. 60). The capitulum, though it arises from a similarly expanded 
base, does not contract so much as in the preceding vertebra; it extends and expands 
to join its serial predecessor and successor ; but it projects slightly preaxially instead of 
projecting postaxially as does that of the thirty-sixth vertebra. 
Tue THIRTY-EIGHTH VERTEBRA. 
This vertebra (figs. 59, 60, & 61, 10) has its centrum a little more antero-posteriorly 
extended (fig. 60,10) and considerably more convex transversely than the centrum of 
the preceding vertebra. 
Its neural spine is quite free, less high, and more slender. 
Its diapophysis (figs. 59 & 61, d") closely resembles that of the thirty-seventh vertebra ; 
but its capitulum is anchylosed (fig. 60, p"’) at a time when the two preceding capitula 
are still united by suture to the centra. It is almost entirely supported by its own 
centrum, is still less contracted above its origin, and, projecting decidedly preaxiad as 
well as dorsad, comes into contact with its own diapophysis, as well as anchyloses with 
the two capitula preceding. 
There is no lateral defect of ossification in the neural arch; but it is slightly exca- 
vated in the middle line postaxially to the neural spine. 
There is no postvertebral interspace or perforation, except what is quite minute. 
THE SACRO-CAUDAL VERTEBR. 
Tue Turrty-NINTH VERTEBRA. 
This vertebra (figs. 59, 60, & 61,11) is slightly more antero-posteriorly extended 
than is the preceding vertebra; its neural spine is lower and more slender; and its 
neural arch is medianly notched at its postaxial border, very decidedly (fig. 61, 11) and 
slightly so at the middle of its opposite margin. 
Diapophysis, parapophysis, and capitulum all combine in one anchylosed transverse 
process, which projects much, as does the diapophysis of the thirty-eighth vertebra, but 
is never dorso-ventrally extended. Its most ventral point of origin does not extend so 
far ventrad as does that of the capitulum of the preceding vertebra. 
