1911] Nervous System of Corydalis 239 



From the cephalic end there are three pairs of large nerve 

 trunks, the mandibular, the maxillary and the labial. The 

 mandibular is the largest the labial the smallest and most 

 ventral. All appear to be mixed nerves, both sensory and motor. 



Either side of the middle line on the cephalic border are 

 two small nerves, the gustatory, which are motor in part at least. 

 On either side of the ganglion not far from its central portion 

 is a small ventral nerve and not far from the connectives near 

 the entrance of the caudal tracheal tubes are the small salivary 

 nerves. I know nothing of the composition of these two last 

 pairs. 



The dense central mass of the ganglion prevents one from 

 tracing nerve fibers very deeply in surface preparations, but a 

 few more fortunate specimens gave now and then a fiber or a 

 tract which could be easily followed. In general with the nerve 

 trunks and connectives of other ganglia, these bundles of fibers 

 entered the central portions and like them, too, the nerve cells 

 were chiefly grouped on the sides with scattering cells on the 

 dorsal and a denser mass on the ventral and caudal portions, 

 but in this the dorsal side has more cells than was usual with the 

 other ganglia. The same arrangement of cells and fibers was 

 noticed as in others, that is, most of the peripheral cells could be 

 seen to send their processes into the central portion. Fibers 

 from the connectives above and below could be traced through 

 the ganglion, but there were such masses of them that it was 

 difficult to tell whether they were branched or not. 



Fibers from the lower connectives were seen to end in the 

 caudal portion of the " punktsubstanz " : (a) On the same side, 

 (b) Crossing over the middle line. These were both superficial 

 fibers and resembled those in the bases of the abdominal gan- 

 glia. Probably deeper fibers end higher up. 



Fibers running down the upper connectives run : (a) Down the 

 connective to end in the central portion of the ganglion; (b) 

 Down the connective to end in the caudal region of the ganglion. 



Probably among both of these groups of fibers there are some 

 which cross over into the opposite side of the ganglion. 



Fibers running down the connectives and crossing over to the 

 opposite side through the commissure connecting the crura cere- 

 bri: (a) Cross over in the commissure to the opposite side and 

 run down to end in the upper or lower portions of the ganglion. 



