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Across 3. water exits these larger pores 7. the class which "true jellyfish" belong to 8. the class where the most primitive hydrozoa are located 10. parasidic worms 12. tiny tubular structure that pulls fluid from the coelom 13. hatchling or juvenile 15. a dramatic physical change 17. hollow tubes that draw in seawater 18. head+thorax 19. penetrates the sponge's body wall 22. a chewing mouthpart 28. larvae of hydrozoans 29. primitive brain 31. eye made up of alot of small individual units 32. the shedding, discarding of an exoskeleton periodically 33. largest class of cnidarians 34. stinging cells located on the tentacles 35. tiny needle made of silica or calcium carbinate 36. one body form of a jellyfish;umbrella shaped, free-floating, jelly-like 37. produces a sticky substance which aids in the attachment to objects 38. sections in a tapeworm's body

Down 1. another form of a jellyfish;tubelike, attaches itself to rocks or something of the sort 2. a tongue- like organ located in the mouth of mollusks 4. makes the sponge's skeleton; made of flexible protein fiber 5. slender, finger- like extensions from the arthropod's gut and are bathed by blood 6. the largest flatworm class 9. internal body walls 11. a structure that extends from an arthropod's body 14. head 16. the simplest of all animals 17. term usd to describe the attachment of sponges to other objects 18. phlum which jellyfish belong to 20. clusters of amoebocytesencased in protective coats 21. central section that contains the mollusk's organs 23. thick protective covering of cells posessed by endoparasites 24. a protective capsule 25. sponge cells that have an irregular shape: like amoebas 26. also called collar cells; lines the internal cavity of the sponge 27. a large group of soft-bodied polyps found in coastal areas all over the world: highly muscular and quite complex 30. small barbed harpoon within the cnidocyte 32. heavy fold of tissue that forms the outer layer of the body