1 1 2 Invertebrate Zoology. 



The Muscular System. The Amphipods are active 

 jumpers. Observe the strong extensor muscles of the tail. 

 Determine also the general arrangement of the muscles 

 which move the appendages. 



The Nervous System. What is the position of the 

 compound eyes ? Are they stalked ox sessile ? Certain spec- 

 imens clearly show, through the transparent sterna of the 

 thorax and abdomen, the ventral ganglionic chain. Is it 

 clearly made up of two strings? Do you find longitudinal 

 and transverse commissures ? Do nerves leave the ganglia ? 

 Does the number of ganglia correspond to the number of 

 segments? Carefully dissect in the region of the head, 

 noting the infra- and supra-cesophageal ganglia and the 

 Msophageal ring or collar. 



Make a drawing of the nervous system, naming all the 

 parts. 



