1911] 



Nervous System of Corydalis 



245 



The middle lobe of the brain or the deutocerebrum is the least 

 marked of any and its nerve trunk the antennal, is the smallest 

 of the three. It enervates muscles at the base of the antena as 

 well as sense organs in it and so is mixed. This lobe is best 

 seen on the cephalic and dorsal side and not at all on the cephalic 

 ventral. 



in 



Fig. S. 





Fig. 9. 



Fig. 8. Supra- and sub-esophageal ganglia with their attached nerves and 

 ganglia. The brain is turned over cephalad. The sub-esophageal ganglion is 

 dorsal. x30. 



a antennal fn frontal nerve 



c clypeolabral v vagus ganglion 



f frontal ganglion o optic 



Fig. 9. Cephalic view of one half of the brain. Methylene blue. x.30. 



