1909] Trachael Supply, Nervous System Corydalis 53 



THIRD ABDOMINAL. 



Similar. More medial supply. Quite a symmetrical distribu- 

 tion of branches in all specimens studied. (Fig. 9.) 



FOURTH ABDOMINAL. 



Very similar to the last. In the type specimen there is an 

 additional inner supply to the cephalic connecti\'es from the left. 

 (Fig. 10.) 



FIFTH ABDOMINAL. 



Similar to the others. In the specimen described, the left 

 cephalic connective mostly supplied from the left side. The cau- 

 dal from the right. (Fig. 11.) 



SIXTH ABDOMINAL. 



Nearly symmetrical in regard to the cephalic and median 

 branches in the type, although the left is a little larger. The 

 caudal connectives supplied largely from the left. (Fig. 12). 



SEVENTH AND EIGHTH ABDOMINAL. 



The seventh ganglion has quite a symmetrical distribution. 

 The most cephalic branches on either side run up the connectives, 

 each on its own side. Two main central parts give tracheoles to 

 the main part of the ganglion, while a very large caudal part on 

 each side runs down the connective with a few short branches to 

 it and then breaks up into two main parts to supply the upper 

 portion of the eighth ganglion, although branches run way down 

 to the very tip of the ganglion as well. Two other main trunks 

 come to the eighth. Two rather large tracheae run up from the 

 caudal and lateral tracheal trunks to enter the ganglion ventrally 

 and laterally. These two last, differ from the other supply of the 

 other ganglia in not being connected with a ventral transverse 

 tracheal branch. Each of these last mentioned breaks up into 

 four or five main trunks and these supply the lower two thirds of 

 the ganglion as well as the numerous nerves which take their 

 origin from this region. (Fig. F and 13.) 



The conditions just described for the Eighth abdominal gan- 

 glion are very uniform. 



As may be seen from the description of the individual ganglia 

 of larval Corydalis, special branches are the only ones which 

 supply the central nervous system with air. These special 

 branches are three on each side to the brain from a large cephalic 

 branch; two pairs to the subesophageal ganglion, the cephalic 



