20 PRELIMINARY EXERCISES 



Note that the body is inclosed by a thin cuticle like that 

 of the paramecium. Note the crescent-shaped nucleus. 



Make written descriptions of the movements of the vor- 

 ticella. 



Make a drawing of the body. 



E. TOPICS FOR FURTHER STUDY. Sum up the char- 

 acteristics of all these animals. Write out a comparison 

 of the manner in which the different forms obtain and digest 

 food, move, breathe, and reproduce. Define a living ani- 

 mal cell from your observation of these forms. 



