Herrick, Surface Anatomy of the Brain of Birds. 175 



cated by the free, projecting olfactory lobes. The other fea- 

 tures of this brain may be gathered from the illustration and the 

 measurements presented elsewhere. 



Aqtiila chryscetos, the golden eagle. The specimen from 

 which this brain was taken measured 2.6 meters from tip to tip 

 of wings. The total length of the brain is 4 cm. The olfac- 

 tory lobes are not fused and do not project. The cerebrum is 



3 



is small, the ]/l. b. d. being 70, as compared with 78.2 for Bubo 



virginianus. The surface is smooth and uniform, even the dor- 

 sal fissure being shallow and very broad. The dorsal fissure is 

 frontal, but not so much so as in Bubo. (Compare Plate 

 xxvi, Figs. 5 and 7 with Vol. I, Plate v. Fig. i.) The op- 

 tic lobes are almost wholly exposed, thus again differing from 

 Bubo. 



Table of Measurements. 



