- m 



*~m n 



A. 



>tn, 



n, 



ag. 



"T 



9 



10 



FIG. 26. 



A, Nervous System of Dragon-fly (Petalura giganttu]. br, brain; coe, 

 connectives ; sag, sub-oesophageal ganglion ; <g,, z , ,, thoracic ganglia ; 

 tn lt t , thoracic nerves ; ag l e , abdominal ganglia ; n 1 10 , ab- 

 dominal nerves ; i 10 shows outer limits of abdominal segments. X 2. 



B, Nervous System of Newly-hatched Dragon-fly Larva (Diplacodes 

 haematodes). e, eye; og, optic ganglion (other references as in A). X53. 

 From Tillyard, "Biology of Dragon-flies". 



