Opinions from M. C. McKenna 1960
- 'Cynodontomys alfi belongs to Cynodontomys'
- 'Deltatherium absarokae is recombined as Didelphodus absarokae'
- 'Diacodon minutus is recombined as Leptacodon minutus'
- 'Diacodon minutus is recombined as Palaeictops minutus' according to Gazin 1956
- 'Ectocion parvus belongs to Ectocion'
- 'Ectocion parvus is a subjective synonym of Ectocion osbornianus' according to Simpson 1943
- 'Ectocion ralstonensis belongs to Ectocion'
- 'Ectocion ralstonensis belongs to Ectocion' according to Gazin 1956
- 'Ectocion superstes belongs to Ectocion'
- 'Ectocion superstes is a subjective synonym of Ectocion osbornianus' according to Simpson 1943
- 'Eucosmodon ultimus is recombined as Neoliotomus ultimus'
- 'Hyopsodus loomisi belongs to Hyopsodus'
- 'Hyopsodus simplex is a nomen dubium'
- 'Hypacodon belongs to '
- 'Hypacodon praecursor belongs to Hypacodon'
- 'Ictops didelphoides is recombined as Palaeosinopa didelphoides'
- 'Labidolemur kayi is recombined as Apatemys kayi'
- 'Leipsanolestes is a subjective synonym of Entomolestes'
- 'Leipsanolestes siegfriedti is recombined as Entomolestes siegfriedti'
- 'Leptacodon is a subjective synonym of Entomolestes'
- 'Leptacodon jepseni belongs to Leptacodon'
- 'Metacodon is a subjective synonym of Geolabis'
- 'Metacodon belongs to ' according to Clark 1936
- 'Niptomomys belongs to Microsyopidae'
- 'Niptomomys doreenae belongs to Niptomomys'
- 'Notharctus minutus is recombined as Anemorhysis minutus'
- 'Pantolestes metsiacus is recombined as Diacodexis metsiacus'
- 'Paratetonius is a subjective synonym of Tetonius'
- 'Paratetonius sublettensis is recombined as Anemorhysis sublettensis'
- 'Pelycodus trigonodus is a subjective synonym of Pelycodus ralstoni'
- 'Peradectes protinnominatus belongs to Peradectes'
- 'Prolimnocyon is a subjective synonym of Prototomus'
- 'Prototomus belongs to Hyaenodontidae'
- 'Prototomus viverrinus belongs to Prototomus'
- 'Tetonius musculus is recombined as Anemorhysis musculus'