| 21. | When crinoid balls are found, they are usually in large compact groups.
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| 22. | Some species of crinoids possessed spikes that grew out of the crinoid ball.
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| 23. | Some species of crinoids possessed spikes that grew out of the crinoid ball.
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| 24. | Crinoids were very abundant in Michigan during the Devonian.
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| 25. | Crinoids were preserved in what is now Frederick County.
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| 26. | Later in the period brachiopods, bryozoans, crinoids, and molluscs predominated.
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| 27. | Examples include ammonites, giant clams, crinoids, rudists, and squid.
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| 28. | Lily-like crinoids were abundant, and trilobites were still fairly common.
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| 29. | Crinoids are suspension feeders and spread their arms wide to catch particles floating past.
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| 30. | Like other echinoderms, crinoids have pentaradial symmetry.
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