136 PHYSIOLOGICAL SERIES. 



D. 179. The brain of a White-tailed Eagle (Halia&us alUcilla). 

 The hemispheres are very broad. The dorsal parts of the 

 right one have been removed to show the ventricle, rlic 

 large corpus striatum, and the narrow cut edge of the 

 pallium. The lateral parts of the corpus striatum have 

 been cut away on the left. The large optic lobes have 

 been treated in a similar way on either side, showing in 

 each the narrow slit-like ventricle and the thickness of the 

 walls. The postero-ventral wall, owing to the presence 

 of the large lateral nucleus, is peculiarly massive. The 

 cerebellum is well developed ; its right half has been 

 removed. This specimen also shows very clearly the 

 club-shaped epiphysis and the origin of its stalk from the 

 roof of the thalamencephalon between the optic thalami. 



0. 0. 1321 L. 



D. 180. The brain of a Sparrow Hawk (Accipiter fringillanus). 

 The hemispheres are broad and somewhat'globular in shape. 

 They cover only the anterior parts of the optic lobes. The 

 latter, as in all birds of prey, are very strongly developed. 



0. C. 1321 M. 



D. 181. The head of a Griffon Vulture (Gyps sp.), with the 

 brain exposed from above. The hemispheres are strongly 

 developed ; they are remarkably broad in their posterior 

 part, but much more pointed in front than in the previously 

 described Falconiformes. 0. C. 1321 o. 



D. 182. Two parts of the brain of a Vulture ( Vultur) in 

 transverse section. The upper specimen is the anterior 

 extremity of the cerebrum, seen from behind. In t In- 

 lower specimen the section has also been made thron.jji 

 the hemispheres, but somewhat further back, just in front 

 of the optic chiasma, through the anterior commi>-uiv. 

 The section surface faces to the front ; it shows clearly the 

 position and relations of the anterior commissure, as well 

 as the lateral ventricles, corpora striata, and pallium. 



0. C. 1321 P. 



