Haast.—On the Extinct Genus Harpagornis. 69 
Harpagornis assimilis. 
Inches. 
Total length ... 6i OBE 
Circumference at its „ы end, dion де ur ге. 
Cireumference at its distal end š =: 54-02 
Cireumference of shaft where ыы M г: 
The shaft of this bone, if we compare its total кыш with that of H. moorei, 
is generally narrower ; this is most conspicuous above the deeply excavated 
process for the attachment of the back-toe metatarsal, where the shaft is 
thinnest. 
The ectocondylar ridge is also more pronounced, by which the shaft 
assumes a more triangular form than it possesses in the larger species. The 
two posterior ridges on both sides of the concave channel are more sharply 
defined, so that the latter is deeper than in H. moorei, approaching in form 
more that of the Australian Eagle. 
HUMERUS. 
Harpagornis moorei. 
I already observed, in the preliminary remarks, that our search in the 
turbary deposits of Glenmark after the humerus of this species had been 
unsuccessful but that we obtained a fragment of that bone from the 
postpliocene alluvium on the banks of the Glenmark Creek, about one mile 
above Glenmark. This fragment consists of the greater portion of the shaft, 
the proximal and distal extremities being broken off. 
The shaft where thinnest has a circumference of 2:20 inches, or 0:15 inch 
more than the same bone of Harpagornis assimilis, of which we possess a 
perfect specimen. 
It doubtless belonged to an adult bird, and, if restored, would be about an 
inch longer than the smaller species. 
Harpagornis assimilis. Pl. VIIL, Figs. 1 and 2. 
Inches. 
Total length ... bes ise m io BÀN 
Cireumference of proximal end ТА is e. 449 
Circumference of distal end T E su MID 
Circumference of shaft where оон .. 905 
This important bone, with the exception of a call v of the radial 
crest, is quite perfect. In its general outlines it has, like the other portions 
of the skeleton, great affinities both to Aquila and Circus. 
The shaft is not so straight as that of Aquila, having below the lower 
termination of the radial crest an outward bend, which is also well exhibited 
in Circus. At the same time, the proximal extremity is more curved towards | 
the ulnar side in the fossil bone. 
