Mollusca & Echinodermata

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Across
  1. 2. mollusk pest that burrows through wood
  2. 3. means "two shells"
  3. 4. class of sea cucumbers
  4. 6. made of calcium carbonate
  5. 9. class of brittle stars
  6. 12. class of snails and slugs
  7. 13. a fleshy pad that some mollusks move around on
  8. 14. class of sea lilies and feather stars
  9. 17. class of sea urchins and sand dollars
  10. 19. mollusk pest that eats garden plants
  11. 20. class of sea stars
  12. 21. mollusk with 8 overlapping plates
Down
  1. 1. class of chitons
  2. 5. structures in cephalopods in place of a foot
  3. 7. part of a mollusk that houses organs
  4. 8. larval state of a mollusk
  5. 10. upper side of an echinoderm
  6. 11. class of clams, oysters and mussels
  7. 13. mollusk part that produces the shell
  8. 15. means "spiny skin"
  9. 16. class of octopus and squid
  10. 18. tongue-like structure that scrapes food
  11. 22. substance secreted by cephalopods that provides protection