A GRASSHOPPER 19 



a pair of nerve connectives passes to the dorsally situated 

 supracesophageal ganglion or brain. The brain is the largest 

 ganglionic mass in the body and is situated in the top of the 

 head between the eyes. Lay bare the brain. Notice the 

 optic lobes going to the eyes, and between them the much smaller 

 ocellar lobes sending nerves to the lateral ocelli. Beneath the 

 optic lobes are the antennal lobes, which send nerves to the 

 antennae, while near them in the median line is the median 

 ocellar lobe, which sends a nerve to the median ocellus. 



Exercise 17. Make a large sketch of the nervous system, repre- 

 senting it in an outline of the animal's body, and show in 

 which segments the different ganglia occur. 



Exercise 18. Draw a diagram representing a side view of a 

 grasshopper on a scale of 3 or 4, in which the segmenta- 

 tion, the relative position of the heart, the alimentary 

 tract, and the nervous system are accurately indicated. 



