QUESTIONS. 93 



67. What is the nature of the respiration ? 



68. Describe the nervous system. 



69. What sort of eyes do they possess ? 



70. What are the principal sub-divisions of this class ? 



71. Give an account of the class Chcetoynatha. 



72. Define the class Scolecida. 



73. What are the principal groups included in this class ? 



74. Give examples of each. 



75. Why are the Rotifera so called ? 



76. Why have they been removed from the class Infusoria ? 



77. Why have they been placed in the class Scolecida ? 



78. In what respects do the males differ from the females? 



79. Describe the digestive organs of the Rotifera. 



80. W T hat is the nature of the nervous system in this group ? 



81. Give an account of the Turbellaria. 



82. Describe the Planaria. 



83. Define the Trematoda, and give examples. 

 8-1. What produces the " rot" in sheep ? 



85. To what group does the "tape- worm" belong? 



86. What are "cystic" worms, and what relation do they sus- 



tain to the tape-worms ? 



87. Describe the ordinary tape-worm. 



88. Give an account of the development of this animal. 



89. What are the "measles" met with in diseased pork? 



90. Give examples of Nematode worms. 



91. How do they differ in structure from the Trematoda? 



92. Describe the Acanthocepltala. 



93. Why are they so called ? 



94. What are the Gordiacece ? 



95. Where do they spend their early life ? 



96. What are they commonly called ? 



97. Why is the class Eclrinodermata so called ? 



98. What animals are included in this class ? 



99. What is meant by "bilateral symmetry" ? 



100. Describe the " test" of a sea-urchin. 



101. How does this test increase in size? 



102. What are the " ambulacral " areas ? 



103. Where are the "genital" and "ocular" plates placed? 



104. Why are they so called? 



105. What is meant by the " madreporiform tubercle" ? 



106. Describe the "tube-feet." 



107. W T hat are " pedicellarke, " and what is their supposed 



function ? 



108. What is the nature and use of the spines ? 



109. How does the covering of the star-fishes differ from that of 



the sea-urchins ? 



110. Describe the digestive organs of the sea-urchins. 



