Herrick, Gustatory Paths m Fishes. 



425 



the main portion of the root fibers turn dorsally along the outer 

 aspect of the vagal lobe to form the superficial communis roots 

 of these nerves. 



Communis root fibers, presumably bearing both general 

 visceral and gustatory impulses, arborize freely in the entire 

 inner, dorsal and lateral surfaces of the vagal lobe, some arbor- 



Fig. 28. An intrinsic neurone of the right vagal lobe of Ameiurus nebulosus 

 seen in cross section. The cell body lies near the mesial border of the right vag- 

 al lobe and the neurite is directed laterally through the middle of the lobe. From 

 a GoLGi preparation. x6o. 



d.X., deep root of the vagus ; s.g.t., secondary gustatory tract ; sj>. V., spinal 

 V tract ; s.X., superficial sensory root of the vagus ; V, ventricle. 



izations also occurring in the center of the lobe. Impulses 

 from the latter are taken up by the intrinsic cells and diffused 

 throughout the entire lobe. For the forms of these cells see 

 Figs. 27, 28, 29, 30, 34. It may be conjectured that these 

 cells receive mainly the unspecialized visceral root fibers, since 

 the gustatory fibers are here, as in cyprinoids, almost certainly 

 related chiefly to the sujDcrficial groups of secondary neurones. 

 Type II cells are abundant in elasmobranchs (Houser, 'oi), 

 whose taste buds are few and confined to the mouth, but were 

 not demonstratable in any of Johnston's Golgi preparations of 



