256 



Ross Granville Harrison 



The larva .was closely observed while alive, and it was noted 

 that slight movements took place in the "aneurogenic" limb. 

 No attempt was made to stimulate electrically, but the spontaneous 

 movements, though very slight, were unmistakable. 



After preservation in Zenker's fluid the specimen was cut into 

 serial transverse sections, and the internal anatomy of the extrem- 

 ities carefully studied. A description of their innervation follows 9^ 



The "aneurogenic" limbs are innervated from three segmental 



Fig. 4 Subject of Experiment I, showing the "aneurogenic'' limbs. Xz\. 

 Fig. 5 Subject of Experiment III. X 3 

 Fig. 6 Subject of Experiment II. X3. 



nerves, the sixth, seventh and eighth. The branch from the sixth 

 is small and does not form anastomoses which are traceable in 

 sections with the others. It runs in the body wall for a consider- 

 able distance ventral to the attachment of the limbs, and finally 



^In this I have been aided by the excellent descriptions given by Gaupp, whose terminology has been 

 followed throughout. 



