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Philippine Journal of Science 
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the body of this sternum, at the anterosuperior angle and in- 
cluding the distance occupied by the first four hsemapophysial 
articular facets, there is a marked concavity which is the con- 
tinuation of the costal groove of the same side. Its lower bound- 
ary is curved, with the convexity toward the keel (Plate IV). 
The keel is not deep by any means and is continued only two- 
thirds the length of the body, its lower border being uniformly 
convex. Anteriorly, the carinal angle is rounded off, the con- 
cave, anterior border above it being sharp for its lower half 
and flat for its upper, terminating superiorly in a stumpy 
manubrium, which is truncated anteriorly, leaving, as it were, 
a small, triangular surface, with the angle below in the middle 
line. The deep coracoidal grooves are remarkably well defined 
in front, in the middle line, at which point they decussate to 
some extent. 
The external surface of the sternal body, upon either side of 
the carina, is smooth, and the line of the pectoral muscle is but 
faintly defined. Occasionally we find in the body of the sternum 
of this and other eagles one or two small, sporadic foraminal 
openings, just as though a bird shot had made a perforation and 
the wound subsequently healed. I find a rather large, nearly cir- 
cular one of these in the sternum of the harpy eagle, it being 
situated on the right side of the body of the bone, near its middle. 
In this species the sternum is somewhat smaller than the one just 
described; but, ventrally, it presents the same profound con- 
cavity, with fewer evidences of pneumaticity, however. The xi- 
phoidal elliptical foramina, one upon either side, are very much 
larger; and this extremity of the bone has an increased width 
due to the lateral extension of the xiphoidal portion, which is 
well seen upon lateral view (Plate V). There is the same num- 
ber of articular facets upon either costal border as we described 
for Pithecophaga jefferyi — indeed, all eagles seem to have the 
same number. The Korean eagle lacks any foraminal openings 
in the xiphoidal end of the bone, and the sharp border there is 
entirely lacking in notches, being wholly at right angles to the 
carina, which fails to run out to it by at least 2 centimeters. 
Within the thoracic cavity of the body of the bone foraminal per- 
forations occur not only down the middle line of the bone to a 
point opposite the last pair of facets on the costal borders, but 
likewise in a great area in front and along both sides to a similar 
point. The coracoidal grooves decussate in this eagle, as they 
do in the white-headed species, and they are invariably of some 
considerable depth. In the latter bird there is also an absence 
