152 TME SNAIL. 



Hearing. Test some snails and determine whether their 

 powers are good in this respect. Note if they respond to 

 noises made close to them when they are expanded. 



Touch. Discover by the experiment of gently irritating 

 the body in different places whether one part is more 

 sensitive than another. 



Smell. There is some evidence that in the snail and in 

 related forms it is a strong sense, e.g. marine gasteropods 

 are usually attracted to crab-pots containing stale fish. 

 Devise an experiment to test this sense. 



Observe how the animal protects itself when unduly 

 alarmed excess of a slimy substance is excreted all over 

 the body. 



Drawings of the snail in different positions should be 

 attempted. 



