NATURE-STUDY LESSONS. 59 



23. (a) Of what is the body of the earthworm com- 

 posed ? 

 (5) Are these segments everywhere exactly alike ? 

 4. (a) Note a thick band a little back of the anterior 

 end of the body. 

 (l>) Describe this band. 



(c) Over how many segments does it extend ? 



25. How many segments are in front of the band ? 



26. Examine the surface of the body by laying the 

 worm over the tip of the forefinger and dragging it 

 backward and forward. 



27. (a) Seize a worm near the posterior end with a 



pair of forceps and draw it backward. 



(d) Is there resistance ? 



(c) With a lens discover small bristle-like struc- 



tures in the body-wall. Make a drawing 

 of one as seen under a compound micro- 

 scope. 



(d) Where are they situated and how are they 



arranged? 



(e) In what direction do they point ? 

 The small bristle-like structure is called a sela (plural se(ie), 



{/) Of what use are these to the worm in crawl- 

 ing? 



28. Why is it difficult for a robin to drag an earth- 

 worm from its hole in the ground? 



29. Draw an earthworm. 



F. The Young Worm. 



30. {a) Where are the eggs deposited ? 



{d) Describe the bag which contains them. 



