Nv 



A 



D 



FIG. 50. Sections through the embryonic ventral cord, x 600. A, gang- 

 lion and lateral nerves of the mandibular segment, Stage XI; B, ganglion 

 of second thoracic segment, Stage XI ; C, connectives between the second 

 and third thoracic ganglia, Stage XI-XII ; D, ganglion and lateral nerves 

 of second thoracic segment, Stage XIV; E, median sagittal section through 

 the ganglia of the first and second thoracic segments. 



