18. Draw on the blackboard the sea-egg pattern.
19. What is a sea-egg or sea-urchin?
20. To what family does it belong?
21. Tell me about the urchin’s overcoat.
22. Describe its quills and suckers.
23. Tell me about the size and color of urchins.
24. How does the urchin’s shell increase in size?
25. Where is its mouth?
26. Can urchins bore holes in rock? Tell me about that.
27. How does the urchin walk and climb?