| 11. | These include algae, polychaete worms, sea anemones, barnacles, bryozoans and hydroids.
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| 12. | It was found on hydroids in Panama.
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| 13. | It is known to feed on hydroids of the genus " Eudendrium ".
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| 14. | Most species are predators of hydroids.
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| 15. | In this work Nutting described 124 new species and beautifully illustrated his monograph on American hydroids.
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| 16. | The majority of hydroids are substrate and forms a bud which remains attached to its parent.
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| 17. | These marine hydroids live in the shelly tubes of serpulid tube worms, which are annelids.
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| 18. | It can be found on hydroids.
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| 19. | The existence of some floating hydroids on Georges Bank has been known for more than 80 years.
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| 20. | The hydroid grows rapidly and may starts to produce medusae when as little as seven weeks old.
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