52 NATURE-STUDY LESSONS. 



(2) The Eyes. 



11. {a) Note the shape and position of the eyes. 

 {b) Discover whether there are eyelids or not. 



{c) What provision is made for protecting the eye- 

 ball? 



(d) Discover whether the eye-ball can be turned in 

 various directions. 



{e) Observe the pupil. 



(/) Draw an eye. 



(.S) Compare the eye of the fish as to covering with 

 that of the frog or snake. 



(3) The Nostrils. 



12. Discover the nostrils, note their number, exact 

 location and arrangement. 



(4) The Ears. 



13. Discover whether a fish can hear. 



(5) The Gill- Covers. 



14. {a) Observe the flaps along the sides of the head 



{b) Note which edges are free and which are 



attached. 

 (c) Examine the large openings along the sides of 



the head. Note their extent. 



(6) The Gills. 



15. {a) Raise a gill-cover and observe the red structure 



beneath it. 

 {b) Of what does a gill consist? 



(c) How many gills are there ? 



(d) How many gill-clefts are there ? 



