188 PROFESSOR OWEN ON THE GENUS DROMORNIS, 
specific gravity, than any bone of Dinornis which I have hitherto received. It is sup- 
posed to have come from a cave in Mount Gambier, South Australia; but I can only 
speak with certainty as to the locality, not as to the circumstances of its discovery. 
One cannot, of course, state confidently that it is a bone of the same species of bird as 
the mutilated femur from the Cave of Wellington Valley1, or of that from the drift at 
Peak Downs, in Queensland 2. 
But the relation of size to these bones, and the difference of proportion to the tibia of 
Dinornis exemplified in the above-given admeasurements, oppose no obstacle to the 
reference, rather support it, and bear out the inference hazarded in a former paper ®. 
I believe, therefore, that Ornithology may confidently add another genus of gigantic 
birds to the unwinged group—a genus which existed and has become extinct in the 
Australian continent, and which had closer kinship with the still existing struthious 
genera of that continent than with the extinct Moas of New Zealand. 
DESCRIPTION OF THE PLATE. 
PLATE XXXII 
Distal portion of tibia of Dromornis australis. 
. Back view. 
. Front view. 
. Inner side view. 
. Broken end of shaft, showing thickness of wall and size of medullary cavity. 
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? Mitchell’s ‘ Three Expeditions into the Interior of Eastern Australia,’ 8vo, ‘‘ Paleontological Appendix,” 
pl. 32. figs. 12, 13 (1838). 
? Trans. Zool. Soe. vol. viii. p. 384 (1872). 
* «From the proportions of the femur of Dromornis I infer also that those of the tibia would be longer 
and more slender than those of Dinornis elephantopus.” 

