288 
AVE3. 
with the Aquila cJirysaetos, the symphyseal region differs, besides its greater 
length, in the less decurvature of the tomia anteriorly, and consequent 
deeper excavation to near the apex. The angular part of the mandible 
resembles that of the species mentioned, but has the inferior angular ridge 
prolonged to the angle, which it is not in the Eagle, and has a better-defined, 
delicately sharp masseteric ridge. The inferior part of the left quadrate 
bone is much like the corresponding part in Aquila chrysaMos. 
Length of the beak from the posterior border of the nares, restored. 0.042 
Length from the anterior >border of the nares .*. 0. 029 
Depth at the anterior border of the nares .... ...»- ... 0. 020 
Width at the anterior border of the nares. 0. 012 
Width at the posterior border of the nares... 0.018 
Length of the sy mphysis, restored ..... 0. 016 
Width at the posterior end of the symphysis . . 0.010 
Width of the nares at the middle... ... .. 0..007 
Length of the mandible from the tomia to the angle .. 0. 0150 
Depth at the posterior end of the tomia.... 0. 0095 
Length of the external condyle (oblique).'. 0. 0100 
Width of the quadrate at the middle. . 0. 0080 
Depth (fore and aft) of the distal end. 0. 0060 
Two cervical vertebrae are preserved from tbe middle of the series. 
They have no hypapophyses, and a small tubercle at the apex of the pos¬ 
terior emargination in the position of a neural spine. The neural canal is 
subcylindric, and the neural arch has two or three small acute tubercles on 
its external face. The arch inclosing the vertebral canal possesses the 
three external grooves well defined, better than in Aquila chrysaetos, and 
the inferior is separated from the inferior face of the centrum by a small 
compressed tubercle. The ridges bounding the upper surface of the neural 
arch behind are stronger than in A. chrysaetos. 
An anterior dorsal vertebra has a wide, flat table, representing a hypa- 
pophysis, which is obliquely truncate on each side behind, and has no prom¬ 
inent apex. Between it and the anterior articular face of the centrum is a 
deep pit. There is a larger pneumatic pit on the posterior face on each side 
of the articular face, which does not penetrate the anterior wall. There is 
a very small capitular surface for a rib. It is probably the first dorsal ver- 
