1?5 

 are prasentel by this nsuroae, it is not charicterizei by a 

 high degree of metabolic activity. 



The epistriatum is one of the nuclei for the termination 

 of olfactory neurones of the second order. Pibres also end 

 here /rhich have ascendei in the tractus strio-thalamicus, and 

 have crossed over in the anterior commissure. Some of the 

 terminations occur near the bodies of the cells, but many of 

 the fibres are to be traced to a narrow zone next the lateral 

 ventricle into which the dendrites of the neurones penetrate 

 (?ig.?3, ol.f.). Here the fibres give off branches /»hich run 

 parallel wit-i the limitans interna. The significance of these 

 terminations will be considered under the heading of the general 

 striatum. 



Comparing the description and figures given by Johnston 

 ( '93a) for the ganoid brain, it would seem that the epistria- 

 tum is the more sharply marked in Mustelus. Although found 

 in an animal ranking lower in the zoological series, the fact 

 is doubtless a correlative of the more powerful olfactory or- 

 gans which characterize the selachian organization. 



b. General Striatum. -- Tne median zone common to the 

 pair of striata contains but few neurones. It is occupied 

 chiefly by interlacing fibres of small calibre. The greater 

 number of these are doubtless commissural, but in the more 

 dorsal region there appear to be connections with the pallium. 



The ^reat mass of the striatum has neurones scattered 



