Opinions from J. F. Mason 1935
- 'Acrocephalites belongs to Conocoryphidae'
- 'Acrocephalites trifossatus belongs to Acrocephalites'
- 'Amecephalus belongs to Olenidae'
- 'Amecephalus strangulatus belongs to Amecephalus'
- 'Anomocarella belongs to Dikelocephalidae'
- 'Anomocarella spatha belongs to Anomocarella'
- 'Bathyuriscus howelli belongs to Bathyuriscus' according to Walcott 1888
- 'Bathyuriscus howelli belongs to Bathyuriscus' according to Toll 1899
- 'Bathyuriscus howelli belongs to Bathyuriscus' according to Grabau and Shimer 1910
- 'Bathyuriscus howelli belongs to Bathyuriscus'
- 'Bathyuriscus howelli lodensis is recombined as Anoria lodensis'
- 'Bathyuriscus maximus belongs to Bathyuriscus'
- 'Branchiata belongs to Arthropoda'
- 'Chancelloria eros belongs to Chancelloria'
- 'Conocoryphidae belongs to Opisthoparia'
- 'Crustacea was reranked as a class and belongs to Branchiata'
- 'Dikelocephalus quadriceps belongs to Dikelocephalus' according to Hall and Whitfield 1877
- 'Dikelocephalus quadriceps is recombined as Olenoides quadriceps' according to Walcott 1886
- 'Dikelocephalus quadriceps is recombined as Olenoides quadriceps' according to Walcott 1888
- 'Dikelocephalus quadriceps is recombined as Olenoides quadriceps' according to Walcott 1890
- 'Dikelocephalus quadriceps is recombined as Dorypyge quadriceps' according to Dames 1884
- 'Dikelocephalus quadriceps is recombined as Dorypyge quadriceps' according to Walcott 1889
- 'Dikelocephalus quadriceps is recombined as Dorypyge quadriceps' according to Matthew 1897
- 'Dikelocephalus quadriceps is recombined as Dorypyge quadriceps'
- 'Hyolithes belongs to Hyolithidae'
- 'Hyolithes princeps belongs to Hyolithes'
- 'Obolidae belongs to Obolacea'
- 'Obolinae belongs to Obolidae'
- 'Ogygia parabola belongs to Ogygia' according to Hall and Whitfield 1877
- 'Ogygia producta is recombined as Niobe producta' according to Brogger 1886
- 'Ogygia producta is recombined as Bathyuriscus productus' according to Pack 1906
- 'Ogygia producta is recombined as Bathyuriscus productus' according to Grabau and Shimer 1910
- 'Ogygia producta is recombined as Dolichometopus productus' according to Walcott 1916
- 'Olenoides typicalis belongs to Olenoides' according to Walcott 1886
- 'Olenoides typicalis is recombined as Zacanthoides typicalis' according to Walcott 1888
- 'Olenoides typicalis is recombined as Zacanthoides typicalis'
- 'Opisthoparia belongs to Trilobita'
- 'Orthis highlandensis is recombined as Billingsella highlandensis'
- 'Pagetia clytia belongs to Pagetia'
- 'Ptychoparia linnarssoni is recombined as Alokistocare linnarssoni'
- 'Ptychoparia piochensis belongs to Ptychoparia' according to Walcott 1886
- 'Ptychoparia piochensis belongs to Ptychoparia' according to Pack 1906
- 'Ptychoparia piochensis belongs to Ptychoparia' according to Grabau and Shimer 1910
- 'Ptychoparia piochensis is recombined as Amecephalus piochensis' according to Walcott 1924
- 'Ptychoparia piochensis is recombined as Amecephalus piochensis' according to Walcott 1925
- 'Ptychoparia piochensis is recombined as Liostracus piochensis' according to Lorenz 1906
- 'Ptychoparia piochensis is recombined as Amecephalus piochensis'
- 'Trilobita was reranked as a subclass and belongs to Crustacea'
- 'Westonia belongs to Obolinae'
- 'Westonia ella belongs to Westonia' according to Walcott 1912
- 'Westonia ella belongs to Westonia'
- 'Zacanthoides belongs to Oryctocephalidae'