Opinions from E. D. Cope 1882
- 'Anacodon belongs to Phenacodontidae'
- 'Anacodon ursidens belongs to Anacodon'
- 'Champsosaurus puercensis belongs to Champsosaurus'
- 'Champsosaurus saponensis belongs to Champsosaurus'
- 'Coryphodon anax belongs to Coryphodon'
- 'Coryphodon curvicristis belongs to Coryphodon'
- 'Coryphodon marginatus belongs to Coryphodon'
- 'Coryphodon repandus belongs to Coryphodon'
- 'Cynodontomys belongs to Prosimiae'
- 'Cynodontomys latidens belongs to Cynodontomys'
- 'Didymictis curtidens belongs to Didymictis'
- 'Didymictis massetericus belongs to Didymictis'
- 'Ectacodon cinctus belongs to Ectacodon'
- 'Hyopsodus lemoinianus belongs to Hyopsodus'
- 'Hyracotherium vortmani is recombined as Phenacodus wortmani'
- 'Manteodon subquadratus belongs to Manteodon'
- 'Metalophodon testis belongs to Metalophodon'
- 'Mioclaenus brachystomus belongs to Mioclaenus'
- 'Mioclaenus etsagicus belongs to Mioclaenus'
- 'Oligotomus osbornianus belongs to Oligotomus'
- 'Orohippus tapirinus is recombined as Systemodon tapirinus'
- 'Pachyaena ossifraga is recombined as Mesonyx ossifragus'
- 'Pachynolophus posticus belongs to Pachynolophus'
- 'Pantolestes metsiacus belongs to Pantolestes'
- 'Pantolestes nuptus belongs to Pantolestes'
- 'Phenacodus apternus belongs to Phenacodus'
- 'Phenacodus brachypternus belongs to Phenacodus'
- 'Phenacodus hemiconus belongs to Phenacodus'
- 'Phenacodus laticuneus belongs to Phenacodus'
- 'Phenacodus macropternus belongs to Phenacodus'
- 'Psittacotherium aspasiae belongs to Psittacotherium'
- 'Sarcothraustes belongs to Mesonychidae'
- 'Sarcothraustes antiquus belongs to Sarcothraustes'
- 'Stypolophus whitiae belongs to Stypolophus'
- 'Systemodon semihians belongs to Systemodon'
- 'Triisodon heilprinianus belongs to Triisodon'