Echinoids 0.0 / 5 ? GeologyEchinoids-irregular and regularA2/A-levelOCR Created by: Isabelle19Created on: 22-05-17 14:27 94102768153 Across 1. Where is the mouth positioned? (2, 3, 6) 7. What shape are irregular echinoids? (5, 6) 8. What are the interlocking plates made out of? (7) Down 2. What membrane surrounds the mouth? (3, 9) 3. Where is the anus positioned? (2, 3, 3) 4. What two things do the tubercles consist of? (3, 4, 3, 3, 7) 5. Class (10) 6. Phylum (13) 9. What type of symmetry do irregular echinoids show? (9, 8) 10. What is a tubercle for? (5, 10)
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