Phylums Echinodermata, Chaetognatha, Hemichordata, Chordata,

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Across 5. planktonic larval stage that follows zygote in Brittle Stars 6. larval stage that follows zygote in Echinoderms 10. expelled in responsed to a predatos that contains a poison called holothurin, very sticky and can immobilize 13. first larval stage that follows fertilization in Holothuroidea 15. planktonic larval stage following bipemaria in Asteroidea 19. located in the ring canal, this aids in the regulation of pressure in the water vascular system 24. process of expelling out all guts and internal organ as a stress response but is later regenerated in Holothuroidea 27. non-feeding planktonic larval stage that follows fertilization in Crinoidea 28. calcerous plates lined with tubules and spines 29. arms of Crinoidea that trap food in ciliated ambilucral grooves that lead to the mouth

Down 1. second larval stage that follows auricullarin in Holothuroidea 2. tadpole larval stage that follows fertilization in Ascidiacea, possesses all characteristics of Chordata 3. help keeps body free of settling planktonic larva and sometime aids in feeding, located on ossicles 4. fluid filled canals that serves as tendon in the Echinoderms and it derived from the hydrocoel, used for locomotion and feeding 7. outer layer of Sea Squirts used for protection 8. located on oral surface, this is where water enters into the water vascular system 9. 10 sacs, 2 at the end of each arm that acts as the respiratory system in Brittle Stars 11. the two rows of tube feet that face upwards in Holothuroidea 12. dirverticulum from gut at the base of the proboscis in Hemichordata 14. the mobile adult version of the Class Crinoidea 15. allows for movement near peristomal membrance in Echinoidea 16. cells within the hemosystem that contains vanadium that assists in the production of tunicin 17. stalked larval stage that settles to substrate and follows the vitellaria stage in Crinoidea 18. larval stage that follows fertilization in Echinoidea 20. produces mucus that moves across the gills basket for food in Ascidiacea 21. third larval stage in Holothuroidea, follows diolarin and last stage before adult 22. bilateral planktonic larval stage that follows zygote in Asteroidea 23. plates that surround the anus Echinoidea 25. the three rows of tube feet that face the substrate in Holothuroidea 26. found at the base of the spines, these tubes aid in gas exchange and excretions

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