72 JoiKNAi. OF Comparative Nei'kologv. 



peduncular tract, and extends caudo-laterad from a short 

 distance cephalo-mesad of the cephalo-lateral extremity of 

 the crura cerebri to about twice that distance caudo-laterad 

 of that place. In traversing this band, the peduncular fibres 

 pass between, not through, the dense clusters of Deiter's 

 corpuscles (Plate \"III, Fig. 9). 



3. A clear lenticular portion, which lies parallel to and 

 entad of number one. The nerve cells in this portion are 

 few and far between. They are of two sorts, flask-shape 

 and pyramidal (Plate VIII, Fig. 7). The cells of the first 

 type are large, gibbous, faintly stained, flask-shaped cells. 

 They have a large, clear, sub-spherical nucleus and a dense 

 nucleolus. The cells of the other type are elongated, densely 

 stained pyramidal cells. They have an elongated dense 

 nucleus and a denser nucleolus. In the meso-cephalad por- 

 tion of this nidulus the flask cells predominate, while in the 

 caudo-lateral portion the pyramidal predominate. 



In traversing this portion, the peduncular Hbres separate 

 into parallel bands of approximately the same size (Plate 

 VIII, Fig. 5). 



3. A wide irregular portion, which consists chiefly of 

 Deiter's corpuscles. Occasionally we find a fusiform cell, 

 and near the meso-cephalad extremity of part one there is 

 usually a cluster of small pyramidal cells. 



After entering this part of the striatum, the peduncular 

 fibres radiate in all directions. 



Caudate Portion. — This is the largest division of the 

 striatum. 



Form. — \iewed from the side, the outline of this division 

 is composed of the following curves: 



I. A convex curve, which forms the cephalad boundary. 

 This curve extends cephalo-ventrad from the dorsal extremity 

 of this division to the cephalo-x entral extremity of the same. 



1. A convex curve, which extends ventro-caudad from 

 the ventral extremity of curve one to the caudo-ventral ex- 

 tremity of the lobe. 



