CHARACTERS OF THE SUB-KINGDOMS. 25 



20. How do the breathing organs differ in the various classes ? 



21. What are the primary divisions of the Vertebrata ? 



22. Name the classes or subdivisions. 



23. What are the points of agreement between Amphibia and 



Fishes ? 



24. How do Reptilia and Birds resemble one another ? 



25. What are the leading distinctions of the Mammalia ? 



26. Define the sub-kingdom Anmdosa. 



27. How does the skeleton differ from that of the vertebrates ? 



28. What is "chitine"? 



29. Describe the nervous system. 



30. What are " ganglia"? 



31. What are " commissures " ? 



32. Name the primary divisions of the Anmdosa. 



33. Name the sub-divisions, and give examples. 



34. What is the nature of the blood in the Arthropoda ? 



35. Why have the Anmdoida been separated from the Annulosa ? 



36. What are the principal characteristics of this sub-kingdom ? 



37. What is the " water vascular system " ? 



38. What classes are included in the Annuloida ? 



39. State why these classes have been placed in the same sub- 



kingdom. 



40. Why are the Mollusca so called ? 



41. What classes are included in this sub-kingdom? 



42. Describe the digestive apparatus in the Mollusca. 



43. Describe the circulatory organs. 



44. Describe the nervous system. 



45. How is respiration effected in this group ? 



46. What is an ' ' odontophore " ? 



47. Define the Molluscoida. 



48. What classes are contained in this sub-kingdom ? 



49. Why have they been separated from the Mollusca ? 



50. Define the Cozlenterata, and give the derivation of the word. 



51. What is the peculiarity of the digestive apparatus in this 



sub-kingdom ? 



52. What classes does it embrace ? 



53. What is the derivation of Protozoa? 



54. Name the classes included in this sub-kingdom. 



55. What is the general character of these groups of animals ? 



56. What is "sarcode"? 



57. What are "cilia"? 



58. What are "pseudopodia"? 



