Echinoderms

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Across
  1. 5. outer covering, covers endoskeleton
  2. 6. means self-cut, ability to drop a body part
  3. 7. Class of sea urchins and sand dollars
  4. 8. class of sea lilies and feather stars
  5. 10. internal skeleton
  6. 12. ability to regrow missing body parts
  7. 13. canal that runs down the ray or arm
  8. 14. class of sea cucumbers
  9. 15. class of brittle stars
  10. 17. type of symmetry for echinoderms
Down
  1. 1. canal connecting madreporite to ring canal
  2. 2. pincerlike spines, cleans body surface
  3. 3. bony plates made of calcium
  4. 4. opening to water vascular system
  5. 9. Class of sea stars
  6. 11. bulb-like top of tube feet
  7. 13. arms that radiate from the central disk
  8. 16. canal the encircles the mouth