Classification of Hay 1899

Cl. Chondrichthyes Huxley 1880 [cartilaginous fish]
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G. †Stemmatias Hay 1899
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†Stemmatias bicristatus St John and Worthen 1875
†Stemmatias bifurcatus St John and Worthen 1875
†Stemmatias cheiriformis St John and Worthen 1875
†Stemmatias compactus St John and Worthen 1875
†Stemmatias keokuk St John and Worthen 1875
†Stemmatias symmetricus St John and Worthen 1875
Invalid names: Stemmatodus St John and Worthen 1875 [replaced]
G. †Hybodus Agassiz 1834
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†Hybodus copei Hay 1899
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Invalid names: Hybodus regularis Cope 1891 [replaced]
G. Myliobatis Cuvier 1816
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†Myliobatis leidyi Hay 1899
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Invalid names: Myliobatis serratus Leidy 1855 [replaced]
G. †Platyxystrodus Hay 1899
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†Platyxystrodus bellulus St John and Worthen 1875
†Platyxystrodus imitatus St John and Worthen 1875
†Platyxystrodus simplex St John and Worthen 1875
†Platyxystrodus verus John and Worthen 1883
Invalid names: Xystrodus Morris and Roberts 1862 [replaced]
G. †Helodus Agassiz 1838
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†Helodus wortheni Hay 1899
G. †Icanodus Miller 1892
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†Icanodus convexus Davis 1883
†Icanodus limitaris St John and Worthen 1875
Invalid names: Tomodus Davis 1883 [replaced]
G. †Xenodus Miller 1892
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†Xenodus hertzeri Newberry 1889
Invalid names: Goniodus Newberry 1889 [replaced]
G. †Dipterus Sedgwick and Murchison 1828
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Invalid names: Dipterus (Ctenodus) radiatus Newberry 1889 [replaced]
Invalid names: Catopterus Agassiz 1833 [synonym]
G. †Pycnodus Agassiz 1833
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†Pycnodus phaseolus Hay 1899
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Invalid names: Pycnodus faba Leidy 1872 [replaced]
G. †Typodus Quenstedt 1858
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†Typodus abrasus Cragin 1894
†Typodus diastemicus Cope 1894
†Typodus dumblei Cope 1892
Invalid names: Mesodon Wagner 1851 [replaced]
G. †Cladodus Agassiz 1843
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†Cladodus claypolei Hay 1899
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Invalid names: Cladodus magnificus Claypole 1894 [replaced]
†Cladodus coniger Hay 1899
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Invalid names: Cladodus carinatus Newberry 1889 [replaced]
G. †Sagenodus Owen 1867
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†Sagenodus textilis Hay 1899
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Invalid names: Sagenodus gurleianus Cope 1897 [replaced]
Fm. †Pycnodontidae Agassiz 1833
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G. †Polypsephis Hay 1899
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Invalid names: Microdon Agassiz 1833 [replaced]
G. †Redfieldius Hay 1899
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†Redfieldius gracilis Redfield 1837
Invalid names: Catopterus Redfield 1837 [replaced]