AVES. 
293 
in the Golden Eagle, and less sharply defined anteriorly and posteriorly 
than in the V. umhrosus. The condyles are much alike in the two species, the 
radial projecting well inward and backward with acuminate apex; the ulnar 
having a greater transverse than antero-posterior diameter. The proximal 
end of the ulna is without olecranon, and presents the usual lip of the inner 
side well developed, with articular surface wider than long. The shaft 
is strongly grooved on the outer superior surface. Three-quarters of an 
inch from the proximal extremity, there commences on the external side of 
the shaft the ridge to which the secondary feathers were secured. The distal 
extremity of the coossified metacarpals is preserved, which supports the 
articular facet for the phalanges on the extremity of the anterior one. The 
distal part of the shaft of the latter presents a longitudinal groove on the 
external face. Altogether, the piece is exceedingly like that of the Golden 
Eagle. The first phalange is triangular in section near the base, being 
broad in front, but consisting mainly of an anterior rod and posterior ala. 
The anterior face becomes concave beyond the distal half The distal 
articular extremity is flat and truncate; it is triangular, and has a narrow 
posterior ala. 
Measurements of the icing-bones. 
M. 
Transverse diameter of the proximal end of the humerus 
Antero-posterior diameter of the head.. 
Antero-posterior diameter at the tuberosity. . 
Diameter of the shaft below the internal marginal crest 
transverse . 
antero-posterior- 
Transverse diameter of the distal end... 
Transverse diameter of the two condyles... 
Transverse diameter of the ulnar condyle. 
Antero-posterior diameter of the same. 
Width of the proximal articular extremity of the ulna. 
Diameter of the shaft of the ulna 0”.04 from the proximal end_ 
Transverse diameter of the extremity of the cobssified metacarpals 
Length of the first phalange. ?. 
Proximal diameter of the same. 
Distal diameter of the same. 
0.032 
0. 010 
0,013 
0.013 
0.013 
0. 028 
0. 020 
0. 011 
0. 008 
0.019 
0. on 
0. 012 
0.037 
0. 009 
0. 007 
The femur presents no marked characters as compared with that of 
Aquila clirysaetos, but is smaller on comparison than are some of the other 
bones, e. y., vertebrae. I'he crests are all sharp. The same remarks apply 
to the tibia, The rough line of the external side is continued to the external 
