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Across 4. larval stage that follows zygote in Echinoderms 6. help keeps body free of settling planktonic larva and sometime aids in feeding, located on ossicles 9. calcerous plates lined with tubules and spines 10. cells within the hemosystem that contains vanadium that assists in the production of tunicin 12. expelled in responsed to a predatos that contains a poison called holothurin, very sticky and can immobilize 15. allows for movement near peristomal membrance in Echinoidea 16. located in the ring canal, this aids in the regulation of pressure in the water vascular system 17. found at the base of the spines, these tubes aid in gas exchange and excretions 18. bilateral planktonic larval stage that follows zygote in Asteroidea 21. 10 sacs, 2 at the end of each arm that acts as the respiratory system in Brittle Stars 22. third larval stage in Holothuroidea, follows diolarin and last stage before adult 23. larval stage that follows fertilization in Echinoidea 25. non-feeding planktonic larval stage that follows fertilization in Crinoidea 26. located on oral surface, this is where water enters into the water vascular system 27. produces mucus that moves across the gills basket for food in Ascidiacea 28. dirverticulum from gut at the base of the proboscis in Hemichordata 29. the three rows of tube feet that face the substrate in Holothuroidea 30. the mobile adult version of the Class Crinoidea

Down 1. the two rows of tube feet that face upwards in Holothuroidea 2. fluid filled canals that serves as tendon in the Echinoderms and it derived from the hydrocoel, used for locomotion and feeding 3. planktonic larval stage following bipemaria in Asteroidea 5. planktonic larval stage that follows zygote in Brittle Stars 7. outer layer of Sea Squirts used for protection 8. tadpole larval stage that follows fertilization in Ascidiacea, possesses all characteristics of Chordata 11. first larval stage that follows fertilization in Holothuroidea 13. plates that surround the anus Echinoidea 14. arms of Crinoidea that trap food in ciliated ambilucral grooves that lead to the mouth 19. process of expelling out all guts and internal organ as a stress response but is later regenerated in Holothuroidea 20. stalked larval stage that settles to substrate and follows the vitellaria stage in Crinoidea 24. second larval stage that follows auricullarin in Holothuroidea