xv, i Shufeldt: The Monkey -eating Eagle 35 
of bone compressed from side to side, with a finely pointed, free 
anterior apex; and, further, it is, ununited posteriorly with the 
palatines. 
Pithecophaga possesses large, spongy maxillopalatines that fill 
up a good part of the rhinal chamber, being carried far to the 
front above the prepalatines, where they appear to merge to 
a slight degree. They are separated for their entire length in 
Aquila, but extensively fuse in Haliseetus leucocephalus, where 
they form a nearly solid roof in the mouth in connection with 
prepalatines and maxillaries. 
Pithecophaga has a very solid bony nasal septum, as has the 
white-headed eagle; while in the golden eagle a good-sized va- 
cuity may occur at the posterior superior angle. 
The hinder part of a palatine in any true eagle has the postero- 
external angle rounded off, the bone in this locality being rather 
broad, with its inner margin produced and turned down, and 
its outer one to some degree thickened. In this part of their 
extent the palatines are in contact with each other, clasping the 
vomer between them anteriorly and the sphenoidal rostrum 
above. 
The basipterygoidal processes are entirely absent in the skulls 
of all the eagles at hand at this writing, save in the case of the 
golden eagles, where they are represented by small triangular 
prickles, flattened from above downward. A lip of bone usual- 
ly underlaps the entrances to the carotid arteries. 
Pithecophaga — and other species of eagles depart but little 
from it — presents a triangular area for the basitemporal space 
of the cranium, with a marked depression just anterior to the 
hemispherical occipital condyle. The foramen magnum is large 
and nearly circular in outline. A superoccipital prominence is 
fairly well developed in all these eagles, including the Korean 
species. 
Although the “occipital area” is well defined, the ridge that 
exists to mark its limitations is not much raised. This is also 
true of the “crotaphyte fossae,” which are extremely shallow, 
subcircular in outline, and widely separated posteriorly. At the 
side of the cranium the crotaphyte fossa extends over onto the 
external surface of the postfrontal apophysis. 
The cranial capacity is only of moderate proportions, when 
taken in conection with the balance of that part of the skull; 
and this is especially true of the cranium of Pithecophaga. 
Laterally, the osseous aural apertures are much exposed; in 
life, however, the soft structures of the internal ear are more or 
