ANNALS OF THE QUEENSLAND MUSEUM, No. 6 
perfectly preserved distal end. Immediately proximad of the 
outer malleolus, the edge of the shaft is dilated, and is slightly 
curved forward, with the result that a distinct, though shallow, 
groove (a) is formed between it and the bridge for the extensor 
tendon ; the opposite edge of the bone is somewhat dilated in the 
recent genera, but in the fossil to a greater extent, and a deep groove 
(b) is formed between it and the foot of the extensor bridge. 
This edge is continuous with the sharp ridge-like edge of the shaft 
which descends from the inner anterior crest (c), the inner limit, 
I presume, of the flexor perforans muscle. The most peculiar 
feature of this tibia is the structure of the extensor bridge. This 
is Y shaped, the fork of the Y arching widely over the inlet orifice, 
and its stem separating two outlets (d and e), one at the proximal 
end of each malleolus. It would seem from this that the extensor 
tendon divided beneath the osseous loop, a circumstance I have 
not before met with. Whether this is an abnormality in the species 
or a constant character in the genus, time alone will show. As 
to the relations of the bird we might, judging by its proportions, 
affiliate it to Astur. It has exactly the same thickness of shaft as in 
A. novcehollandice, but it is 5 mm. longer. But in structure it 
approaches more nearly to Nisaetus, which has a similarly wide 
and deep extensor sulcus, a dilatation of the shaft near the inner 
malleolus, and a flexor perforans ridge on that edge of the bone. 
The hawk seems therefore to stand somewhere between the Goshawk 
and the Little Eagle. Locality, Lower Cooper. Loc. 5. 
Baza gracilis n.s. 
Humerus. — Plate I., fig. 4. — A very imperfect humerus 
from the left wing, consisting chiefly of the shaft, with remains of 
the condyles at the distal end. I am led to attribute this bone 
to a member of the Falconidce, mainly by the position and extent 
of the pectoralis scar (a), and of so much of the anterior crest as 
still surmounts it, by the curvatures of the shaft, the status of 
the epicondylar tuberosities, and by the relative size of the radial 
condyle as is indicated by its remains. Among the hawks, with 
a humerus of corresponding size — that is, of the smaller kinds — Baza 
subcristata seems on the whole to have the greatest likeness to the 
fossil, and to have an uncommon feature, which it might well 
have received from the extinct bird. Pending correction by future 
discovery, the two may fairly be considered to be congeneric. 
The head of the fossil is broken off at the proximal end of the 
pectoral scar, which has much the same form and extent as in 
B. subcristata, but is more on the dorsal edge of the bone, and is 
separated by a well-marked sulcus from the base of the anterior 
crest. At the distal end, the ulnar condyle is, with the part adjacent, 
almost entirely destroyed ; the radial condyle, fortunately in great 
part preserved, does not nearly extend to the level of the ectepi- 
condylar tuberosity (c), from which, as in Baza, a transverse ridge 
