| 21. | All were imperforate and printed locally by hand.
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| 22. | A woman with an untreated imperforate hymen may find it impossible to be examined.
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| 23. | It was an imperforate sheet valued at 70p.
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| 24. | In addition to flattened shells, members of the group have an imperforate aperture.
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| 25. | The aperture is truncate to subovate and imperforate.
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| 26. | As with all Miliolina, the test wall in alveolinids is porecelaneous and imperforate.
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| 27. | The unifying character is their imperforate porcelaneous tests.
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| 28. | The agglutinated wall is externally imperforate, the interior with a coarse alveolar network.
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| 29. | In 1917 the Provisional Government reprinted the old Tsarist designs, but sold them imperforate.
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| 30. | The second stamp issue is easy to tell from the original because it is imperforate.
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