232 JOHNSTON. [VOL. I. 



cells impregnated in his preparations are multipolar with axis 

 cylinders entering the tractus strio-thalamici (basal bundles of 

 Edinger's earlier work). He does not mention or figure collat- 

 erals. Either the pyramidal cells with short axis cylinders 

 described above for the internal nucleus were not impregnated 

 in his preparations, or from seeing the axis cylinders directed 

 toward the basal bundle he has concluded that they join it. 

 Whether the cells with short axis cylinders described above are 

 the same as those referred to by Van Gehuchten ('94) as having 

 been described by Bellonci in teleosts ('79 ?) I cannot tell, as I 

 have not had access to Bellonci's paper. In a single case I 

 have found a small cell in the intermediate portion of the stri- 

 atum with two dendrites and with short axis cylinder disposed 

 longitudinally. 



The fibers having their endings in the corpus striatum come 

 from two or three sources: the olfactory lobe, the thalamus, 

 and probably the cortical area. The fibers from the olfactory 

 lobe which pass into the corpus striatum are best seen in such 

 a section as that represented in Fig. 2 (//-. olf.\ These fibers 

 end, so far as I have seen, only in the internal nucleus of the 

 corpus striatum. The fibers entering the corpus striatum 

 from the thalamus (Fig. 4, D] are the ascending or sensory 

 fibers described by Van Gehuchten ('94) in the Tractus strio- 

 thalamici (basal bundles) of the trout. Probably the greater 

 number of these fibers cross in the anterior commissure (Fig. 

 3, ant. com.), but some seem to find endings on the same side. 

 They are fine or medium-sized varicose fibers which end by fine 

 ramifications in the internal nucleus of the corpus striatum. I 

 have not found their endings in the external nucleus. In addi- 

 tion to the fibers last mentioned, the anterior commissure con- 

 tains a small number of thick, strongly varicose fibers which 

 course around the lateral surface of the fore-brain and enter 

 the corpus striatum at its dorso-lateral angle (Fig. 3, assoc.f.}. 

 Either before or after entering the corpus striatum these fibers 

 break up into several very fine branches which run for a long 

 distance in the internal nucleus parallel with its layers of cells. 

 These fibers will be described below as the probable axis 

 cylinders of the cells of the cortex. 



