Herrick, Gustatory Paths in Fishes. 



401 



trigemini," Mayser) of the carp is considerably simpler than 

 that of the vagal lobes. It is in general similar in internal organi- 

 zation to the facial lobes of Ameiurus, though its cells are of 

 quite different form and it differs externally in that there is a 

 complete fusion in the middle line of the right and left lobes 

 with no clearly defined external or internal boundary between 

 them. 



^' facial lob 



Fig. ly. Transverse section through the facial lobe of Minytrema 7nelanops 

 (Raf.). GoLGi method. X 4°- 



The section passes through the cephalic part of the facial lobe and includes 

 the extreme cephalic end of the vagal lobe and the caudal end of the tuberculum 

 acusticum. It shovi^s five chief secondary gustatory neurones at the surface of 

 the lobe and internally at a an imperfect impregnation of a cell of the interme- 

 diate zone of the same type shown in Fig. 18, a. 



asc.s.g.t., main ascending secondary gustatory tract ; f./.iii., fasciculus longi- 

 tudinalis medialis ; r.com. VII, communis (gustatory) root of the facialis ; r.IX. 

 mot., motor root of the glossopharyngeus ; 5tr. F///, secondary fibers from the 

 tuberculum acusticum to ventral commissure ; s.g.t. VII, secondary gustatory 

 tract from the facial lobe ; sp. V, spinal V tract ; tub.ac, tuberculum acusticum. 



The center of the lobe is filled with very small intrinsic 

 neurones arranged in dense clusters or rosettes of from 10 to 

 100 cells each. In Fig. 5 the clear spaces in the neuropil of the 



