1870. ] HULKE—WEALDEN VERTEBRA. 321 
The transverse processes (¢r) are simple, stout and short. They 
project horizontally outwards from the outer border of the prezyga- 
pophyses. The left one, which appears to be unmutilated, measures 
nearly 3°5 inches along its upper surface. It bears a terminal, oval, 
slightly hollow costal surface (cs), the long axis of which, nearly ver- 
tical, measures 2°5 inches, while the horizontal shorter axis is 1:1 
inch. The under surface of the transverse process rests on a strong 
buttress-like plate, which ascends towards its outer end from the 
anterior margin and adjacent outer aspect of the neurapophysis. 
This plate forms the outer wall of a large and deep triangular hollow 
beneath the anterior margin of the transverse process. 
One of the most remarkable characters in the vertebra is a thin 
horizontal platform ( p/t) which extends along the side of the vertebra, 
from the back of the transverse process anteriorly to the postzyga- 
pophyses behind, in the level of the crown of the arch. Its original 
breadth is not now ascertainable, for its outer border is broken; 
but in its present mutilated state, it extends outwards to the dis- 
tance of 5 inches from the neural spine. It is strengthened in 
front by a stout ridge produced outwards from the outer half of the 
posterior border of the prezygapophysis and the adjacent anterior 
pillar of the neural spine. A curved notch, 2 inches long, the only 
remaining natural edge of the platform, separates the outer end of 
this ridge from that of the transverse process. At about 2°5 inches 
behind the first ridge the platform is strengthened by a second; and, 
corresponding to this, a strong bracket-like plate (bt) descends from 
the under surface (of the platform) towards the centrum, filling the 
angle included by the horizontal under surface of the platform and 
the nearly vertical outer surface of the neurapophysis. The lower 
end of this bracket forks just before it reaches the centrum. Be- 
tween the bracket and the buttress which springs from the anterior 
border of the neurapophysis to the outer end of the transverse 
process, is a very large deep hollow under the platform. Its sides 
are formed by the bracket and buttress just mentioned; and its 
bottom corresponds to the thinnest part of the neurapophysis, which 
at this part is only about -1 inch thick, and is strengthened by small 
buttresses and arches in high relief. A similar but smaller hollow 
is present behind the great vertical bracket, between it and the post- 
zygapophysis. A third, and still smaller pit occurs at each side of 
the vertical median plate descending from the postzygapophyses to 
the arch, which allows the entrance of the plate into the notch be- 
tween the prezygapophyses when the vertebre are articulated. 
From the upper surface of the platform several thin strut-like 
plates ascend on the sides of the neural spine. 
The neural canal (nc) has a singular construction, which I do not 
remember to have seen in any other vertebra. The anterior mar- 
gins of the neurapophyses form a wide, simple, low-spanned opening ; 
and within this there is a very beautiful interior arch (vy) with groins 
projecting from the spring of the arch and from the roof, and con- 
verging to a central point lying just under the front of the neural 
