Herrick, Gustatory Paths in Fishes. 393 



Some of these fibers or their collaterals ente/ directly the motor 

 layer and there arborize. Others end by simple arborizations 

 in the substantia reticularis and others turn caudad in the des- 

 cending secondary communis tract. Whether any go cephalad 



Fig. 10. Transverse section through the vagal and facial lobes of the spotted 

 sucker, Minytrema melanops (Raf.) from a fish 8 cm. long. Golgi method. X 40- 



On the left at a a single chief secondary gustatory neurone is impregnated 

 whose neurite sends collaterals into the dorsal part of the motor layer of the 

 vagal lobe. On the right the area marked by the crosses is filled with a rich im- 

 pregnation of similar cells which are not sketched in. At 3 is a single secondary 

 neurone of the type shown in Fig. I2, and at c imperfect impregnations of deeper 

 secondary neurones of the intrinsic type. On the right one cell of the motor 

 layer is impregnated whose dendrites reach secondary gustatory tracts partly 

 within the vagal lobe and partly in the substantia reticularis. 



aj-if. J- .^.A, ascending gustatory tract ; com.r.VII, communis (gustatory) root 

 of the facialis ; desc.s.g.i., descending secondary gustatory tract, entering sub- 

 stantia reticularis ; /./.w., fasciculus longitudinalis medialis; Int., lemniscus; 

 mot.r., motor root of the vagus ; s.g.t., secondary gustatory tract from the vagal 

 lobe ; sp. V, spinal V tract; sup.r., superficial gustatory root of the vagus. 



