AVES. 
289 
tebra. As compared with the corresponding one of the Golden Eagle, with 
which it agrees in size, it differs in the greater width of the hypapoj)hysial 
table, and the entire absence of its median process. The two succeeding 
dorsal vertebrae are wanting, should the number have been the same as in 
the Golden Eagle,—seven. This is not certain; but the two which come 
next of those of the V. umbrosus which are preserved, present a dispropor¬ 
tion in size, so like that seen in those occupying the same position, third 
and fourth from the sacrum, in the Golden Eagle, that the relations were 
probably the same in both species. Those preserved will then be the first, 
third, fourth, sixth, and seventh dorsals, with the dorso-sacral continuous 
with the sacrum. The third dorsal presents a hypapophysial table similar 
to that of the first, but differing in the more produced anterior lateral angles. 
Like it, it differs from the corresponding one of the Golden Eagle in its 
much greater horizontal extent, w'ant of downward projection, and want of 
median spine. The large lateral pneumatic fossa is more median in position 
than in the first, and the rib-facet is higher up. The fourth vertebra is held 
in connection with the third by remaining portions of matrix, and differs 
from it in greater length of centrum and the compressed spine-like hypa- 
pophysis. The pneumatic foramen is median, and immediately at the base 
of the hypapophysis, lower down and smaller than in the third vertebra. 
The costal facet is higher up; the diapophysis is well developed, with an 
anterior and posterior fossa separating the wide superior and narrow inferior 
planes. The posterior articular face of the centrum is subtriangular in out¬ 
line, with rounded angles and slightly concave sides. The sixth dorsal 
strongly resembles the fourth. Its anterior articular face is subquadrate in 
outline, a little broader than long, and differs much from that of the third in 
its greater vertical depth and much less excavation. The prezygapophyses 
have not a lateral external crest continued into the diapophyses, and the 
latter are more posterior in position. The hypapophysis is similarly com¬ 
pressed, and its basal pneumatic foramen is reduced in size. The seventh 
dorsal differs from the others in the absence of hypapophysis. Its inferior 
face is acutely carinate, and the pneumatic foramen is wanting. The dia¬ 
pophysis is much reduced, and there is a small pneumatic foramen at its base 
19 G R 
