Opinions from E. D. Cope 1874
- 'Adocus lineolatus belongs to Adocus'
- 'Agathaumas milo is a subjective synonym of Hadrosaurus occidentalis'
- 'Agathaumas sylvestris belongs to Agathaumas'
- 'Aublysodon mirandus is a subjective synonym of Aublysodon horridus'
- 'Bottosaurus perrugosus belongs to Bottosaurus'
- 'Cimolichthys anceps belongs to Cimolichthys' according to Cope 1872
- 'Cimolichthys anceps is recombined as Enchodus anceps'
- 'Cimolichthys semianceps belongs to Cimolichthys' according to Cope 1872
- 'Cimolichthys semianceps is recombined as Empo semianceps'
- 'Cimolichthys sulcatus belongs to Cimolichthys' according to Cope 1872
- 'Cimolichthys sulcatus is recombined as Empo sulcata'
- 'Cinodon belongs to Dinosauria'
- 'Cinodon arctatus belongs to Cinodon'
- 'Clidastes planifrons belongs to Clidastes'
- 'Deinodon horridus is recombined as Aublysodon horridus'
- 'Edestosaurus dispar is recombined as Clidastes dispar'
- 'Edestosaurus stenops is recombined as Clidastes stenops'
- 'Edestosaurus tortor is recombined as Clidastes tortor'
- 'Empo contracta belongs to Empo'
- 'Empo merrillii belongs to Empo'
- 'Enchodus gladiolus is recombined as Cimolichthys gladiolus' according to Cope 1872
- 'Enchodus gladiolus is recombined as Phasganodus gladiolus'
- 'Enchodus petrosus belongs to Enchodus'
- 'Hadrosaurus foulkei is a misspelling of Hadrosaurus foulkii'
- 'Holcodus coryphaeus is recombined as Platecarpus coryphaeus'
- 'Holcodus tectulus is recombined as Platecarpus tectulus'
- 'Ichthyodectes perniciosus belongs to Ichthyodectes'
- 'Lestosaurus felix is recombined as Platecarpus felix'
- 'Lestosaurus gracilis is recombined as Platecarpus gracilis'
- 'Lestosaurus latifrons is recombined as Platecarpus latifrons'
- 'Lestosaurus simus is recombined as Platecarpus simus'
- 'Liodon crassartus is recombined as Platecarpus crassartus'
- 'Liodon curtirostris is recombined as Platecarpus curtirostris'
- 'Liodon dyspelor belongs to Liodon'
- 'Liodon glandiferus is recombined as Platecarpus glandiferus'
- 'Liodon ictericus is recombined as Platecarpus ictericus'
- 'Liodon mudgei is recombined as Platecarpus mudgei'
- 'Liodon nepaeolicus belongs to Liodon'
- 'Macrosaurus proriger is recombined as Liodon proriger'
- 'Ornithochirus harpyia is a subjective synonym of Pterodactylus occidentalis'
- 'Ornithochirus umbrosus is recombined as Pterodactylus umbrosus'
- 'Pachyrhizodus leptopsis belongs to Pachyrhizodus'
- 'Palaeoscincus costatus belongs to Palaeoscincus'
- 'Pelecorapis belongs to Synentognathi'
- 'Pelecorapis varius belongs to Pelecorapis'
- 'Plastomenus insignis belongs to Plastomenus'
- 'Plastomenus punctulatus belongs to Plastomenus'
- 'Polyonax mortuarius belongs to Polyonax'
- 'Portheus mudgei belongs to Portheus'
- 'Pterodactylus ingens belongs to Pterodactylus'
- 'Pterodactylus occidentalis belongs to Pterodactylus'
- 'Pterodactylus owenii is a subjective synonym of Pterodactylus occidentalis'
- 'Pterodactylus velox belongs to Pterodactylus'
- 'Rhinosaurus micromus is recombined as Liodon micromus'
- 'Saurocephalus phlebotomus belongs to Saurocephalus' according to Cope 1870
- 'Saurocephalus phlebotomus is recombined as Daptinus phlebotomus'
- 'Saurocephalus thaumas is recombined as Portheus thaumas'
- 'Sironectes belongs to Pythonomorpha'
- 'Sironectes anguliferus belongs to Sironectes'
- 'Sporetodus janevaii belongs to Sporetodus'
- 'Tetheodus pephredo belongs to Tetheodus'
- 'Thespesius occidentalis is recombined as Hadrosaurus occidentalis'
- 'Trachodon mirabilis is recombined as Hadrosaurus mirabilis'
- 'Trionyx vagans belongs to Trionyx'
- 'Troodon formosus belongs to Troodon'