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Across 1. Organs of excretion in the annelids 4. Human Beings 6. Organs of gaseous exchange in spiders 10. Stinging organelles found in Cnidarians 12. Space between the shell and muscle 13. Largest of all animal phylums 21. Silicon Dioxide spicules 22. Tiny bristles found on an earthworm's body 24. Toothed tongue of molluscs 25. Reproductive part of annelids 26. Openings that connect the inside of the throat to the outside of the neck 27. Fixed in one place 29. Head of a Tapeworm 30. Body part that extends beyond the anus of chordates 31. Flukes belong to this class 32. Having separate sexes 33. Rod-shaped body found in embryos of all chordates 34. Movement facilitated by pseudopodia. 35. A layer of jelly-like substance found in Cnidarians 36. Parasitic worm of Humans

Down 2. Lobe covering the mouth of the earthworm 3. Organs of digestion, reproduction and excretion in molluscs 5. Name for kidney in molluscs 7. Pincer-like structures found on echinoderms 8. Chiton belongs to this class 9. Nitrogen-containing polysaccharide 11. Causes African Sleeping Sickness. 14. Makes up the skeleton of echinoderms 15. Annelids name for "heart" 16. Respiratory organs in molluscs 17. Round-worms 18. Blood cavity 19. Where is food digested in sponges? 20. Functions in locomotion, gas exchange and feeding in star fish 23. Head-end 28. Act as kidneys in Platyhelminthes