1911] Nervous System of Corydalis 247 



The great bulk of fibers connected with the crura seem to 

 take origin or terminate in the central portion of the "punkt- 

 substanz." 



The ocular nerves enter the protocerebrum through large 

 nerve trunks which form a decided lobe on the surface of the 

 brain. At the junction of this ocular lobe with the ganglion 

 there is a little area of deeply staining substance mentioned, 

 before and back of this are nerve cells, and also a few cells on 

 the eye side of the mass. These may be seen to send their 

 processes into a dark mass and in towards the main part of the 

 brain. Fibers run out the nerve from the ocular lobes' deep 

 staining mass and into the spherical body before mentioned and 

 into parts of the " punktsubstanz " near it, the former are pro- 

 cesses from cells located near the ocular "punktsubstanz." 

 About the spherical mass may be seen many nerve cells whose 

 fibers are connected with it. 



Nerve cells on all surfaces of the protocerebrum are very 

 numerous and may be seen sending their processes into the 

 central fibrous mass of the ganglion. 



The deutocerebrum is less marked than the other two 

 neuromeres and the fibers of its nerve, the antennal, come in 

 closer to the clypeolabial segment of the brain than the ocular 

 portion. The fibers of the antennal nerve can be traced as a 

 distinct band for nearly one-half of the distance from its 

 entrance to the middle line, where they seem to end in a mass of 

 deep staining fibers of the clypeolabral trunk where it joins 

 the main central portion and here at least some fibers can be 

 seen to end well towards the caudo-ventral portion of the 

 ganglion. 



The tritocerebrum is best marked in the dorso-cephalic side 

 of the ganglion where it lies over the crus. The fibers of its 

 nerve seem to be of two sorts. The labral part is often stained 

 while the arched nerve portion is clear. Both branches enter 

 the ganglion and plunge at once into the mass of deeply stain- 

 ing fibers. Not quite so many cells were stained overlying this 

 region in the specimens prepared. Some of these sent fibers 

 more or less directly into the central mass while others as in 

 other surfaces of the brain seemed to be association cells in a 

 small area. 



