1911] Nervous System of Corydalis 251 



the dorsal part of the ganglion a thick layer, in the middle 

 region of the brain. 



A group of large cells occurs dorsally either side of the mid- 

 dle line, most of these point ventrally or centrally and send fibers 

 to the crura cerebri, to the commissures and to the central por- 

 tions of the fibrous mass ; theirs are the longest fibers recognized 

 from any cells in the brain. 



Out laterally and ventral to the ocular lobes in the region 

 of the antennal lobe and just above the crura is a small group of 

 nerve cells, sending fibers into the crura and into the fibrous 

 substance near that region of the brain. 



In the cephalic region the cells surrounding the spherical 

 mass may be seen divided into a dorsal, a ventral and a median 

 group of small cells, already mentioned, while larger ones fill in 

 on the dorsal side and are part of the general dorsal mass. 

 These and the median masses run together and separate again 

 at various levels, groups of smaller and larger cells often alter- 

 nating, and these are continued on the cephalic and caudal sides 

 of the ganglion. One of the most marked is a small group of 

 cells surrounding a curved lobe of the central mass of the 

 ganglion and continuous with cells on the cephalic side of the 

 brain. 



Fiber Tracts in the Brain. 



(1) The labial. Fibers seem to end chiefly in the dense 

 fibrous mass located in the labial lobe. A few fibers could be 

 traced doubtfully into a dorso-lateral group of cells. 



(2) Antennal nerve. Fibers from this end in cell groups 

 either side of it. Fibers pass down ventrally into the lateral 

 central part of the ' ' punksubstanz ' ' in large masses where some of 

 them end, others cross to the ventral side and run in strands 

 back in the main tract of the crura towards the other side. 

 Others run towards the crus of the same side and apparently 

 into it. 



(3) Ocular. Fibers seem to end in the lateral mass of the 

 ocular lobe, numbers of them connect this with the more median 

 spherical "punktsubstanz." Fibers connect these two masses 

 and fibers from the surrounding cell groups run into one or 

 both of them. 



Fibers connect the ventral epithelial-like cell region with 

 the lateral dark mass, and also with an adjoining group of small 

 cells more medially situated. 



