NERVUS TERMINALIS IN AMIA 



101 



tions, are shown in numbers, with nerve cells at intervals. The 

 nerve cells have from one to four branching processes establishing 

 anastomoses which set the longitudinal fibers and the cells in 

 connection with .each other. When the cells are examined with 

 a high magnification there does not seem to be any marked 

 differentiation into axones and dendrites (figs. 34 and 35). 

 All the cell processes look quite similar, as is the case in an intes- 

 tinal sympathetic plexus. Moreover, the fibers appear to be 

 continuous from one cell to another. The cytoplasm of some 

 of the cells shows a copious supply of tigroid bodies (figs. 34 



Fig. 31. Approximately transverse section of a Golgi preparation of young Amia 

 about 12 mm. long, to show the details of a neurone of the pineal stalk. X 200. 



and 35). There is an epithelium lining the tube of the pineal 

 stalk. The nerve cells and fibers lie among the bases of these 

 epithelial cells near the basement membrane. The structure of 

 this epithelium has not been studied to learn whether it shows 

 evidence of being glandular or not, but I have noticed a set of 

 capillaries here with finer meshes. The enlarged distal end of 

 the stalk has essentially the same structure and manner of inner- 

 vation as the stalk proper. 



