GRASSHOPPER. 81 



crop. The crop is connected with the mouth by a narrow 

 tube, the gullet or oesophagus. Draw the alimentary tract. 



Remove the alimentary canal by cutting through oesoph- 

 agus (close to the crop) and intestine, and look upon the 

 floor of the abdomen for the nervous system. Can you find 

 enlargements (ganglia) in this? How are they arranged 

 with regard to the somites? Follow the nervous system 

 forward, if possible, into the head. Can you find cords 

 passing around the oesophagus as in the crayfish? Is 

 there a brain above the gullet? Does the alimentary canal 

 pass through the nervous system? Draw the nervous 

 system. 



Draw a diagram of a transverse section passing through 

 the thorax, showing the body-wall, wings, legs, spiracles, 

 egg-masses, nervous cord, alimentary canal, and heart 

 in their relative positions. 



