94 ZOOLOGY. 



111. Describe the "water- vascular system." 



112. What is meant by " Aristotle's Lantern ?" 



113. What is the course of the circulation in the sea-urchins? 



1 14. What is the nature of the respiration ? 



115. Describe the nervous system. 



116. Give an account of the metamorphosis of the "brittle star.'* 



