Opinions from C. L. Gazin 1952
- 'Antiacodon crassus is a nomen dubium'
- 'Antiacodon crassus is a nomen dubium' according to Cope 1884
- 'Antiacodon crassus is recombined as Sarcolemur crassus' according to Cope 1877
- 'Antiacodon mentalis is recombined as Hyopsodus mentalis'
- 'Cynodontomys knightensis belongs to Cynodontomys'
- 'Diacodon pineyensis belongs to Diacodon'
- 'Hexacodus belongs to Artiodactyla'
- 'Hexacodus pelodes belongs to Hexacodus'
- 'Hexacodus uintensis belongs to Hexacodus'
- 'Lophiotherium vasacciense is recombined as Hyracotherium vasacciense'
- 'Lophiotherium vasacciense is recombined as Hyracotherium vasacciense' according to Matthew 1899
- 'Lophiotherium vasacciense is recombined as Hyracotherium vasacciense' according to Cope 1884
- 'Mioclaenus brachystomus is a subjective synonym of Diacodexis metsiacus'
- 'Notharctus limosus belongs to Notharctus'
- 'Orotherium index is recombined as Hyracotherium index' according to Cope 1884
- 'Orotherium index is recombined as Hyracotherium index' according to Cope 1877
- 'Orotherium index is a subjective synonym of Hyracotherium angustidens' according to Kitts 1956
- 'Orotherium index is a subjective synonym of Hyracotherium angustidens' according to Pavlow 1888
- 'Orotherium index is a subjective synonym of Hyracotherium angustidens' according to Lydekker 1886
- 'Orotherium index is recombined as Hyracotherium index'
- 'Orotherium index is recombined as Hyracotherium index' according to Matthew 1899
- 'Pantolestes nuptus is recombined as Diacodexis nuptus'
- 'Paratetonius sublettensis belongs to Paratetonius'
- 'Pentapassalus belongs to Epoicotheriidae'
- 'Pentapassalus pearcei belongs to Pentapassalus'
- 'Peratherium chesteri belongs to Peratherium'
- 'Peratherium edwardi belongs to Peratherium'
- 'Phenacodus macropternus is recombined as Bunophorus macropternus'
- 'Prodiacodon concordiarcensis is recombined as Diacodon concordiarcensis'
- 'Prolimnocyon elisabethae belongs to Prolimnocyon'
- 'Sarcolemur is a subjective synonym of Antiacodon'
- 'Sarcolemur bicuspis is a nomen nudum'
- 'Sarcolemur bicuspis belongs to Sarcolemur' according to Loomis 1907
- 'Tetonius musculus is recombined as Paratetonius musculus'
- 'Tetonius musculus belongs to Tetonius' according to Matthew 1915
- 'Tetonius tenuiculus is recombined as Paratetonius tenuiculus'
- 'Tillomys senior belongs to Tillomys'
- 'Uintacyon asodes belongs to Uintacyon'
- 'Viverravus lutosus belongs to Viverravus'
- 'Vulpavus asius belongs to Vulpavus'