Flatworms and Roundworms 383 



9. Explain the complex life cycle of the liver fluke, including the stages in cor- 

 rect sequence, the different hosts, and the detrimental effects of the various 

 stages. 



10. Discuss the economic importance of flatworms and roundworms. 



11. Explain why the digestive system is considered a gastrovascular cavity in 

 certain types of worms. 



12. List the conclusions you can draw from your studies of flatworms and round- 

 worms. 



SELECTED REFERENCES 



Cameron: The Internal Parasites of Domestic Animals, London. 



Chandler: Introduction to Human Parasitology, John Wiley & Sons, Inc. 



Craig and Faust: Clinical Parasitology, Lea & Febiger. 



Faust: Human Helminthology, Lea & Febiger. 



Gamble: Platyhelminthes; in vol. 2, Cambridge Natural History, The Macmillan 



Co. 

 Hegner, Root, Augustine, and Huff: Parasitology; With Special Reference to 



Man and Domestic Animals, D. Appleton-Century Co., Inc. 

 Mackie, Hunter, and Worth: Manual of Tropical Medicine, W. B. Saunders Co. 

 Ward and Whipple: Fresh Water Biology, John Wiley & Sons, Inc. 



