OBSERVATIONAL LESSON XXVII 



89 



DIRECTIONS TO THE 

 PUPIL 



(2) Allow your snail to 

 crawl inside the glass tube. 

 Write a description of the 

 shell, mentioning its shape 

 and colour. Make a careful 

 drawing of the whole creature. 

 Answer the questions, where 

 are its eyes ? Where is its 

 mouth ? Indicate their posi- 

 tion on your sketch. 



(3) Examine carefully the 

 skin of the animal, and write 

 down two special features of 

 it. 



(4) Gently touch one of the 

 tentacles or " horns." What 

 happens ? Watch carefully the 

 way in which the horn 

 reappears. 



(5) Turn the tube round 

 and look at the underside of 

 the animal. Describe how it 

 moves from place to place. 

 Make a sketch, and discover 

 the large opening on the right 



side under the edge of the shell, through which the creature breathes. 



v 



FIGURE 205. The underside of a Snail. 



