THE ANIMAL KINGDOM. 



173 



12. Describe the structure and habits of the fresh- 

 water Polype, or Hydra. 



13. Give some examples of animals which undergo 

 metamorphosis. 



14. To what sub-kingdom, class, and order do Sloths 

 belong? Where are they found, and what are their 

 habits ? 



15. What is Ivory, and whence is it obtained ? 



1 6. What are the breathing organs of fishes, and how 

 do they breathe ? 



17. What are the chief distinctive characters of the 

 Ruminantia ? 



1 8. How do the teeth of a cat differ from those of a 

 sheep, and what relation can be pointed out between the 

 forms and kinds of the teeth, and the habits of life of 

 each ? 



19. What animals are called " Zoophytes," and why? 



20. Give examples of migratory animals, and state the 

 reason for their migration ? 



21. What are the mammary glands, and what animals 

 possess them ? 



22. Enumerate the orders of birds, and give the 

 characteristics of the order Raptores ? 



23. Describe the transformations of a frog, or of a 

 newt, in respect to the organs of locomotion and of 

 respiration. 



24. How does the Viper differ from the harmless com- 

 mon snake ? 



25. What is meant by hybernation, and what animals 

 hybernate ? 



26. What fishes possess the power of giving electric 

 shocks ? 



27. What are Star-fishes? Give an account of their 

 structure. State to what sub-kingdom, class, and order 

 they belong. 



