FORM, GROWTH, AND CHANGE 25 



cords pass forwards through the neck and become linked with 

 a large suboesophageal ganglion (Fig. 13 sb g), situated in the 

 head behind the mouth, the centre of nerve-supply for all the 

 jaws and representing therefore the fused ganglia of the three 

 or four hinder segments of the head. From this the two main 



br 



-\-o.l 



---.A. 



. 6 



FIG. 13. NERVOUS SYSTEM OF A GRASSHOPPER. 



br, brain ; ol, optic lobes ; oe, gullet ; s&.g, suboesophageal 

 ganglion ; md, mx, I, mandibular, maxillary and labial nerves ; 

 i Hi, thoracic ; I 6, abdominal ganglia, x 2. Inpart after 

 Emerton. 



