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Across 2. central section that contains the mollusk's organs (2 Words) 5. tiny tubular structure that pulls fluid from the coelom 6. tiny needle made of silica or calcium carbinate 7. a dramatic physical change 8. the class where the most primitive hydrozoa are located 13. primitive brain (2 Words) 14. a protective capsule 15. eye made up of alot of small individual units (2 Words) 18. hatchling or juvenile 21. produces a sticky substance which aids in the attachment to objects (2 Words) 24. marine animals that live in the ocean. 25. the simplest of all animals 26. a type of Arthropod. 28. sections in a tapeworm's body 30. hollow tubes that draw in seawater 32. stinging cells located on the tentacles 34. also called collar cells; lines the internal cavity of the sponge 37. clusters of amoebocytesencased in protective coats 38. the shedding, discarding of an exoskeleton periodically 39. small barbed harpoon within the cnidocyte 40. head 41. larvae of hydrozoans

Down 1. slender, finger- like extensions from the arthropod's gut and are bathed by blood (2 Words) 3. parasidic worms 4. internal body walls 6. the class which "true jellyfish" belong to 9. head+thorax 10. a large group of soft-bodied polyps found in coastal areas all over the world: highly muscular and quite complex (2 Words) 11. another form of a jellyfish;tubelike, attaches itself to rocks or something of the sort 12. a chewing mouthpart 16. water exits these larger pores 17. are simple, single-celled animals 19. one body form of a jellyfish;umbrella shaped, free-floating, jelly-like 20. sponge cells that have an irregular shape: like amoebas 22. a structure that extends from an arthropod's body 23. makes the sponge's skeleton; made of flexible protein fiber 27. largest class of cnidarians 29. thick protective covering of cells posessed by endoparasites 31. penetrates the sponge's body wall 33. a tongue- like organ located in the mouth of mollusks 34. phlum which jellyfish belong to 35. the largest flatworm class 36. term usd to describe the attachment of sponges to other objects 38. heavy fold of tissue that forms the outer layer of the body