Across
- 4. sea urchins and sand dollars
- 5. a fused rigid endoskeleton that organisms are contained within
- 6. small calcium carbonate plates that can extend through the skin
- 7. brittle stars and basket stars
- 9. the portion of a starfish that can be pushed out to ingest food
- 12. feeding mouth of jaw and teeth
- 13. a canal that circles the mouth
- 14. bulb like sac on top of each tube foot
- 15. sieve-like plate on aboral side that water filters through
- 16. sea star or starfish
- 18. extends from the ring canal to the arms
- 19. sea lilies and sea feathers
Down
- 1. small movable appendages attached to an echinoderm
- 2. network of small canals that channel water
- 3. sea cucumbers
- 8. breaks down food and pushes it to digestive glands
- 10. free swimming larva of sea star
- 11. small pincers
- 17. a tube that connects madreporite to ring canal