Echinoderms

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Across
  1. 4. small calcareous plates
  2. 7. symmetry; animal has no front or back
  3. 8. runs from mouth to tips of arms
  4. 10. coiled digestive system
  5. 11. part of the nerve going down the arms
  6. 14. mouth side of the specimen
  7. 15. symmetry of larva
  8. 16. skin gills
  9. 17. tube feet
  10. 19. sea cucumbers
  11. 20. serves in movement&respiration
Down
  1. 1. brittle stars
  2. 2. pincer like; at the base of spines
  3. 3. stomochord
  4. 5. sea stars
  5. 6. flower like class
  6. 8. not mouth side of the specimen
  7. 9. digestive glands
  8. 12. sea urchins
  9. 13. leads to the water vascular system
  10. 18. symmetry of adult echinoderms