92 ZOOLOGY. 



25. How do holometabolic differ from JiemimetaboUc insects ? 



26. Describe the metamorphosis of each of these groups. 



27. Explain the terms larva, pupa, and imago. 



28. What is a cocoon ? 



29. Why are the Myriapoda so called ? 



30. Give the definition of this class. 



31. Give examples. 



32. In what respects do they differ from the Imecta ? 



33. What is the nature of the metamorphosis in the Myriapoda ? 



34. What animals are included in the class Arachnida ? 



35. Define the Arachnida. 



36. What is the cephalothorax ? 



37. How do scorpions sting ? 



38. What are spinnerets ? 



39. Describe a spider's thread. 



40. Describe the appendages of the head in the spiders and 



scorpion. 



41. How do spiders kill their prey ? 



42. Describe the process of respiration in the Arachnida. 



43. What are pulmonary sacs ? 



44. What is the nature of the nervous system ? 



45. Describe the organs of sight. 



46. Describe the development of the Arachnida. 



47. What are the principal divisions of this class, and how are 



they distinguished ? 



48. Define the class Crustacea. 



49. Describe the exoskeleton of the lobster. 



50. What is the "carapace"? 



51. What is meant by the "head" and the "tail" of the lobster? 



52. How many pairs of antennae have the Crustacea ? 



53. What is the usual number of limbs in this class ? 



54. What are swimmerets ? 



55. What are "foot jaws " ? 



56. What is the "telson"? 



57. Describe the heart and circulatory organs of the lobster. 



58. Describe the breathing organs of the lobster. 



59. What is the nature of the eyes in the higher Crustacea and 



in the lower groups ? 



60. Describe the organ of hearing. 



61. Give an account of the metamorphosis of the common shore 



crab. 



62. Define the Annelida, and give examples. 



63. Describe the organs of locomotion possessed by some members 



of this class. 



64. What is the nature of the digestive organs ? 



65. What is the nature of the circulatory fluid ? 



66. What is meant by the " pseudo-hsemal " system? 



