| 31. | The imperforate shell has a turbinate shape.
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| 32. | Wall, calcareous, imperforate, porcelaneous.
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| 33. | Beginning in 1919 an imperforate variety ( no perforations between stamps ) was also issued.
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| 34. | Fifty imperforate blocks were printed on roughly torn paper which were sold to the public.
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| 35. | They were uncoloured designs embossed in plain relief on coloured wove paper and were imperforate.
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| 36. | The columella is imperforate at its lower extremity, oblique, bearing three unequal folds.
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| 37. | The apertural face and peripheral keel, where the two faces meet, are imperforate.
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| 38. | The umbilical side is imperforate and smooth.
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| 39. | Booklet panes can be associated with any combination of one, two or three imperforate sides.
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| 40. | Harrison Proof Cards exist for both values with an imperforate stamp in full colour on each.
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