1911] Nervous System of Corydalis 241 



penetrate in between the tracts and a few cells appear ven- 

 trally on the median line, while the cells become more numerous 

 laterally. The salivary nerves enter latero-ventrally and unite 

 with the mass of longitudinal fibers. The cells disappear dor- 

 sally, but some are between the mass of fibers of each con- 

 nective and the lateral cell group has become more ventral. 

 There is at this level a transverse commissure on the dorsal 

 side and fibers running down ventrally in the ventral line. 

 Farther along the fibers do not so many of them run from 

 dorsal to the ventral side and a median commissure comes to be 

 formed. More cells come in laterally and ventrally and these 

 sending their fibers into the central mass contribute to its 

 complexity. These cells also run into the large but ill-defined 

 median commissure. 



Two little spots of darker more dense fibers come in on the 

 ventral side and fibers from the ventral cells form an arch 

 about them. 



Farther cephalad the median commissure becomes less well 

 defined. The dorsal is lost and a median group of cells comes 

 in dorsally again. Fibers from the ventral and dorsal cells, 

 especially the former go in curved sweeps to the dorsal and 

 ventral sides of the fiber mass, fibers also run in laterally from 

 the lateral cell groups. Farther along no clear commissure can 

 be seen, but sweeps of fibers cross from both sides, those of 

 opposite sides interdigitating to some degree. The ventral 

 darker mass of fibers mentioned a short time ago has now 

 become a transverse mass and is larger, being joined by fibers 

 from the labial and ventral nerves. At the level of this entrance 

 only a few scattering groups of cells are seen. 



The dark fiber mass becomes expanded to the center of the 

 ' ' Punktsubstanz. 



The broad cerebral cruri are reached. From the central to 

 the dorsal side laterally four small groups of nerve cells mostly 

 small, with now and then a large one are seen. Fibers from the 

 cerebral crus can be traced to the center of the fiber mass and 

 into one or more of the several irregular masses of dark fibers. 

 Dorsally and ventrally fibers cross from side to side and run 

 diagonally from the dorsal to the ventral side. Farther along 

 a ventral commissure of dark fibers is present, some of its strands 

 reaching up into the dark fibers in the direction of the com- 

 missure and farther along breaking through it. A short dis- 



