1G2 ON A BONE OF AN EXTINCT EAGLE, BY C. W. DE VIS. 



it is tumid laterad, raised into a narrow sharp ridge palmad and 

 by its protrusion anconad deepens the concavity over the ulnar 

 condyle — the radial condyle is but moderately long, in direction it 

 is characteristically oblique. The ectepicondylar tuberosity is 

 elongate, extending proximad upon the radial border: it is incras 

 sate;l but gives oft* no distinct process — the probrachialis insertion 

 is wide, shallow as a rule, especially on its distal limits, and tra- 

 verses the whole palmar surface. 



The part in Uroaetus, the Wedge-tailed Eagle of t lie present 

 day, is distinguished by the separation of the articular from the 

 non-a v ticular surface of the ulnar condyle, by an oblique ridge 

 passing from the most distal point of its ental aspect across its 

 convexity in the direction of the pr >ximal end of the radial 

 condyle. 



Together witli the general characters of the Falconida> the 

 fossil possesses this special feature and is therefore entitled to a 

 place provisionally in the genus Uroaetus 



Though not wider in its expansion than in U. audax, in both 

 fore and aft and transverse diameter of the shaft it is of greater 

 dimensions: the radial condyle is more oblique and be'ng rounded 

 oft' instead of pointed at its proximal end is apparently shorter. 

 The ulnar condyle is smaller having a shorter anconopalmar 

 diameter. The intercondylar groove is deeper, so that the con- 

 necting link between the condyles is much slenderer. The ectepi- 

 condylar tuberosity is shorter and more tumid. 



The sum of these differences is sufficiently great to warrant 

 the recognition of a species and, to distinguish it, the writer pro- 

 poses the term brachialis in allusion to the strength of the fore- 

 arm. 



This fossil is the first relic of an arboreal bird of flight 

 hitherto lecognised amongst the remains of the extinct birds of 

 Queensland; while still fresh it was within the jaws of Thylacoleo, 

 the familiar perfoiations made by the conical teeth of that bone- 

 eater are, in corresponding positions, present on both aspects of 

 the distal expansion. 



