Opinions from E. D. Cope 1869
- 'Astrodon johnstoni belongs to Astrodon'
- 'Belodon lepturus belongs to Belodon'
- 'Brachydectes newberryi belongs to Brachydectes'
- 'Brimosaurus grandis belongs to Brimosaurus'
- 'Colosteus belongs to Ganocephala'
- 'Colosteus crassiscutatus belongs to Colosteus'
- 'Colosteus foveatus belongs to Colosteus'
- 'Colosteus marshii belongs to Colosteus'
- 'Crocodilus obscurus is recombined as Holops obscurus'
- 'Crocodilus tenebrosus is recombined as Holops tenebrosus'
- 'Dendrerpeton obtusum belongs to Dendrerpeton'
- 'Elasmosaurus belongs to Sauropterygia'
- 'Elasmosaurus orientalis belongs to Elasmosaurus'
- 'Elasmosaurus platyurus belongs to Elasmosaurus'
- 'Goniopoda was reranked as a suborder and belongs to Dinosauria'
- 'Hadrosauridae belongs to Orthopoda'
- 'Hadrosaurus belongs to Hadrosauridae'
- 'Hadrosaurus foulkii belongs to Hadrosaurus'
- 'Holops cordatus belongs to Holops'
- 'Hylaeosaurus belongs to Iguanodontidae'
- 'Hyposaurus fraterculus belongs to Hyposaurus'
- 'Iguanodon belongs to Iguanodontidae'
- 'Iguanodontidae belongs to Orthopoda'
- 'Ischyrosaurus belongs to Sauropterygia'
- 'Laelaps belongs to Goniopoda'
- 'Laelaps aquilunguis belongs to Laelaps'
- 'Manatus antiquus is recombined as Ischyrosaurus antiquus'
- 'Mastodonsaurus durus is recombined as Eupelor durus'
- 'Megalosaurus belongs to Goniopoda'
- 'Molgophis belongs to Microsauria'
- 'Molgophis macrurus belongs to Molgophis'
- 'Oestocephalus belongs to Microsauria'
- 'Orthopoda belongs to Dinosauria'
- 'Palaeoscincus belongs to Iguanodontidae'
- 'Palaeoscincus costatus belongs to Palaeoscincus'
- 'Pariostegus belongs to Microsauria'
- 'Pariostegus myops belongs to Pariostegus' according to Cope 1868
- 'Pariostegus myops belongs to Pariostegus'
- 'Perosuchus fuscus belongs to Perosuchus' according to Cope 1868
- 'Plesiosaurus lockwoodii belongs to Plesiosaurus'
- 'Poekilopleuron [misspelled as Poecilopleurum] belongs to Goniopoda'
- 'Polycotylus belongs to Sauropterygia'
- 'Polycotylus latipinnis belongs to Polycotylus'
- 'Sauropleura digitata belongs to Sauropleura'
- 'Sauropleura pectinata is recombined as Oestocephalus pectinatus'
- 'Sauropleura remex is recombined as Oestocephalus remex'
- 'Scelidosauridae belongs to Orthopoda'
- 'Scelidosaurus belongs to Scelidosauridae'
- 'Sphyraena carinata belongs to Sphyraena'
- 'Stenopelix belongs to Scelidosauridae'
- 'Thecachampsa sericodon belongs to Thecachampsa'
- 'Thecachampsa sicaria belongs to Thecachampsa'
- 'Thespesius occidentalis is recombined as Hadrosaurus occidentalis'
- 'Thoracosaurus brevispinus is recombined as Holops brevispinus'
- 'Thoracosaurus glyptodon is recombined as Holops glyptodon'
- 'Trachodon mirabilis is recombined as Hadrosaurus mirabilis'