| Semicassis pyrum
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| A shell of Semicassis pyrum, lateral view
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| Scientific classification
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| Kingdom:
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Animalia
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| Phylum:
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Mollusca
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| Class:
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Gastropoda
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| Subclass:
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Caenogastropoda
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| Order:
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Littorinimorpha
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| Family:
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Cassidae
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| Genus:
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Semicassis
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| Species:
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S. pyrum
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| Binomial name
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Semicassis pyrum
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| Synonyms
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- † Cassidea multisecta H. J. Finlay, 1924
- Cassidea stadialis Hedley, 1914
- Cassis nivea Brazier, 1872
- Cassis pirum
- Cassis pyrum Lamarck, 1822
- † Cassis striatus F. W. Hutton, 1873
- Cassis tumida Petterd, 1886
- Phalium pyrum (Lamarck, 1822)
- Phalium stadiale (Hedley, 1914)
- Semicassis (Semicassis) pyrum (Lamarck, 1822)
- Semicassis pyrum f. hamiltoni (A. W. B. Powell, 1928)
- Semicassis pyrum pyrum (Lamarck, 1822)
- Xenogalea denda Cotton, 1945
- Xenogalea finlayi Iredale, 1927
- Xenogalea halli Cotton, 1954
- Xenogalea mawsoni Cotton, 1945
- Xenogalea powelli H. J. Finlay, 1928
- Xenogalea pyrum (Lamarck, 1822)
- Xenogalea spectabilis Iredale, 1929
- Xenogalea stadialis (Hedley, 1914)
- Xenogalea wilsoni Cotton, 1954
- Xenophalium (Xenogalea) abernethyi Dell, 1956
- Xenophalium (Xenogalea) matai A. W. B. Powell, 1952
- Xenophalium abernethyi Dell, 1956
- Xenophalium finlayi (Iredale, 1927)
- Xenophalium hamiltoni A. W. B. Powell, 1928
- Xenophalium harrisonae A. W. B. Powell, 1928
- Xenophalium matai A. W. B. Powell, 1952
- Xenophalium pyrum (Lamarck, 1822)
- Xenophalium pyrum pyrum (Lamarck, 1822)
- Xenophalium wanganuiense A. W. B. Powell, 1928
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Semicassis pyrum, common name the "pear bonnet" or "common helmet", is a species of large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells, bonnet shells and their allies.