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31

Across 5. Secrete the mineralized spicules 7. Phylum 9. The gelatinous matrix within a sponge 10. Another type of collagen-producing cell 12. Green algae are this to some sponges 13. Means "little mouth" 16. Pleated tube or vase shape 17. Secrete polysaccharides that also form part of the mesohyl 21. Silica spicules, never has spongin fibres 24. External skeleton 25. No spongin, may have an asconoid, syconoid or leuconoid body shape 27. Male reproductive cell 28. Conduct signals and cause parts of the animal to contract 29. Kingdom 30. Channels leading to the interior through the mesohyl 31. The single-layered skin over all the parts of the mesohyl not used by porocytes

Down 1. Tiny spike-like structures 2. Amoeba-like cells that move slowly through the mesohyl and secrete collagen fibres 3. Exaggerated syconoid shape 4. Act as the immune system 6. The cylindrical or conical collar surrounding a flagellum 7. Tubular cells which make up the pores of a sponge 8. The process by which sclerocytes produce silica spicules 11. Internal support structure 14. In addition to or instead of sclerocytes, demosponges have "blank" that secrete a form of collagen that polymerizes into spongin 15. A type of collagen protein that forms some sponges fibrous skeleton 18. Ameba-like cells that are totipotent 19. Tube or vase shape 20. The tail-like structure that projects from the cell body and is used to move water through the sponge body 22. Domain 23. Many species contain spongin fibres 26. Female reproductive cell