Opinions from J. B. Hatcher et al. 1907
- 'Agathaumas belongs to Ceratopsidae'
- 'Agathaumas milo is a nomen nudum'
- 'Agathaumas sylvestris belongs to Agathaumas'
- 'Agathaumidae is a subjective synonym of Ceratopsidae'
- 'Bison alticornis is recombined as Triceratops alticornis'
- 'Centrosaurus apertus belongs to Centrosaurus'
- 'Ceratops belongs to Ceratopsidae'
- 'Ceratops horridus is recombined as Triceratops horridus'
- 'Ceratops montanus belongs to Ceratops'
- 'Ceratopsia belongs to Predentata'
- 'Ceratopsidae belongs to Ceratopsia'
- 'Claorhynchus belongs to Trachodontidae'
- 'Claorhynchus trihedrus belongs to Claorhynchus'
- 'Diceratops belongs to Ceratopsidae'
- 'Diceratops hatcheri belongs to Diceratops'
- 'Dysganus is a nomen nudum'
- 'Dysganus bicarinatus is a nomen nudum'
- 'Dysganus encaustus is a nomen nudum'
- 'Dysganus haydenianus is a nomen nudum'
- 'Dysganus peiganus is a nomen nudum'
- 'Hadrosaurus paucidens is recombined as Ceratops paucidens'
- 'Manospondylus belongs to Theropoda'
- 'Manospondylus gigas belongs to Manospondylus'
- 'Monoclonius belongs to Ceratopsidae'
- 'Monoclonius belli is recombined as Ceratops belli'
- 'Monoclonius canadensis is recombined as Ceratops canadensis'
- 'Monoclonius crassus belongs to Monoclonius'
- 'Monoclonius dawsoni belongs to Monoclonius'
- 'Monoclonius fissus is a nomen nudum'
- 'Monoclonius recurvicornis is recombined as Ceratops recurvicornis'
- 'Monoclonius sphenocerus belongs to Monoclonius'
- 'Polyonax is a nomen dubium'
- 'Polyonax mortuarius is a nomen dubium'
- 'Predentata belongs to Dinosauria'
- 'Stegoceras belongs to Ceratopsidae'
- 'Stegoceras validus belongs to Stegoceras'
- 'Sterrholophus is a subjective synonym of Triceratops'
- 'Torosaurus belongs to Ceratopsidae'
- 'Torosaurus gladius belongs to Torosaurus'
- 'Torosaurus latus belongs to Torosaurus'
- 'Triceratops belongs to Ceratopsidae'
- 'Triceratops brevicornus belongs to Triceratops'
- 'Triceratops calicornis belongs to Triceratops'
- 'Triceratops elatus belongs to Triceratops'
- 'Triceratops flabellatus belongs to Triceratops'
- 'Triceratops obtusus belongs to Triceratops'
- 'Triceratops prorsus belongs to Triceratops'
- 'Triceratops serratus belongs to Triceratops'
- 'Triceratops sulcatus belongs to Triceratops'