156 ZOOLOGY. 



QUESTIONS V. 



1. Give the derivation of the term Actinozoa. 



2. Give examples of this class. 



3. What are its principal characteristics ? 



4. Explain the terms MESENTERIES, ECTODERM, ENDODERM, 



CCENOSARC, ACTINOSOMA. 



5. Give an account of the structure of the SEA- ANEMONE. 



6. What is coral ? 



7. What is the distinction between SCLERODERMIC and SCLERO- 



BASIC corals ? 



8. Give an account of the various forms of CORAL REEFS. 



9. What is an ATOLL ? 



10. How does the red coral of the Mediterranean differ from the 



reef -building corals ? 



11. Describe the Ctenopliora? 



12. Define the class Hydrozoa? 



13. Give examples of this class. 



14. How does the section of a Hydrozob'n differ from that of an 



Actinozoon ? 



15. Distinguish between POLYPES, POLYPITES, and POLYPIDES. 



16. What is the hydrosoma ? 



17. What are the leading distinctions between the Hydrozoa and 



the Polyzoa ? 



18. Give an account of the structure and habits of the FRESH- 



WATER HYDRA. 



19. What are THREAD- CELLS ? 



20. Give an account of the reproduction of the Hydra. 



21. Describe the CORYNID^E or CLUB-HYDRAS. 



22. What is meant by ALIMENTARY ZOOIDS ? 



23. What are GONOPHORES ? 



24. Give an account of the different kinds. 



25. What is the MANUBRIUM ? 



26. Give an account of the development of the NAKED-EYED 



MEDUSAE. 



27. What is meant by "alternation of generations ? " 



28. Describe the Sertularidce. 



29. How do they differ from the Corynidce ? 



30. Give an account of the Lucernaridce. 



31. What is a HYDRA-TUBE? 



32. Give an account of the development of the great JELLY-FISHES. 



33. What are the principal points of difference between tho 



HIDDEN-EYED and NAKED-EYED MEDUSAE? 



34. Why are the Infusoria so called ? 



35. Define this class. 



36. Give examples. 



