Classification of Mason 1935
Ph. Arthropoda Latreille 1829 [arthropod]
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Invalid names: Branchiata Fitzinger 1843 [empty]
G. †Bathyuriscus Meek 1873
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†Bathyuriscus howelli Walcott 1886
†Bathyuriscus maximus Mason 1935
Fm. †Olenidae Burmeister 1843
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G. †Amecephalus Walcott 1924
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†Amecephalus piochensis Walcott 1886
†Amecephalus strangulatus Mason 1935
Fm. †Oryctocephalidae Beecher 1897
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Fm. †Hyolithidae Nicholson 1889
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Fm. †Dikelocephalidae Miller 1889
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