SECT. V 



THE NERVOUS SYSTEM 



69 



Just as the sharp bending of the head led to a 

 condensation of the ventral musculature into the 

 sinewy mass above . described, so it would naturally 

 lead to a fusing of the anterior ventral ganglia, as 

 shown in Fig. 18. We should thus expect to find at 



FIG. 18. Anterior end of the same, bent as in Fig. i to show the change in the 

 central nervous system due to the bending of the body. 



least the first three or four pairs of ganglia of the 

 ventral chain fused to form one infra-cesophageal 

 ganglion ; the outgoing nerves, however, would remain 

 distinct, except perhaps the first antennal nerve, which, 

 as we have said, might have been fused for a short way 

 with the cesophageal commissures, or might even, as 



