Hekrick, Gustatory Paths in Fishes. 



391 



These neurones are densely crowded in radial arrange- 

 ment over the entire periphery of the vagal lobe and are of very 

 peculiar form. They are unipolar with irregularly elongated 

 cell body and dendrite springing from the inner end. The 



fuberculum 

 acusticum 



'SC 



sec )( 



Fig. 8. Sagittal section through the vagal lobe of a young carp. GoLGl 

 method. Drawn from the same series as Fig. 7, but farther toward the right 

 side, so as to cut tangentially the extreme right borders of the vagal and facial 

 lobes. X 40. 



The figure illustrates a few gustatory neurones of the vagal lobe and (imper- 

 fectly) endings of the gustatory root fibers, also two neurones of the deeper por- 

 tion of the layer of secondary neurones whose processes reach the motor layer 

 (cf. Fig. 7). These cells appear to be of the same type as the large cell lying in 

 the layer of secondary tracts in Fig. 13. The neurone in the facial lobe is sketched 

 in from the section lying next mesially, It occupies the area intermedia of the 

 facial lobe and spreads out over the whole of the lateral aspect of the latter, its 

 neurite not being shown. It is evidently of the same type as the one figured in 

 Fig 18 at a. 



peripheral end of the cell body is drawn out to a point which 

 seems usually to reach the external limiting membrane of the 

 vagal lobe. In these young fishes the external layer of root 

 fibers is relatively thin. In older carp this layer is much thicker 

 and there is no well defined external limiting membrane. The 

 bushy dendrite breaks up at once into a very dense mass of 



