Opinions from G. H. Girty 1915
- 'Anthraconeilo taffiana belongs to Anthraconeilo'
- 'Athyris orbicularis is recombined as Cleiothyridina orbicularis'
- 'Bellerophon branneri is recombined as Patellostium branneri'
- 'Bellerophon meekianus is corrected as Bellerophon meekiana and belongs to Bellerophon'
- 'Bellerophon montfortianum is recombined as Patellostium montfortianum'
- 'Bellerophon percarinatus is recombined as Pharkidonotus percarinatus'
- 'Chimnitzia parva is recombined as Zygopleura parva'
- 'Coloceras liratum belongs to Coloceras'
- 'Cyathaxonia profunda is recombined as Lophophyllum profundum'
- 'Dentalium meekianum is recombined as Plagioglypta meekiana'
- 'Derbyia [misspelled as Derbya] belongs to Articulata'
- 'Edmondia ovata belongs to Edmondia'
- 'Euomphalus (Straparollus) utahensis is recombined as Euomphalus utahensis'
- 'Euomphalus planispira is recombined as Straparollus planispira'
- 'Euomphalus planodorsatus is corrected as Euomphalus planidorsatus and belongs to Euomphalus'
- 'Euomphalus quadrivolvis is recombined as Straparollus quadrivolvis'
- 'Holopea proutana belongs to Holopea'
- 'Ianthinopsis gouldiana belongs to Ianthinopsis'
- 'Inachus catilloides is recombined as Schizostoma catilloides'
- 'Leda bellistriata belongs to Leda'
- 'Lima retifera belongs to Lima'
- 'Limatula fasciculata belongs to Limatula'
- 'Loxonema multicostata is recombined as Zygopleura multicostata'
- 'Loxonema oligospira is recombined as Holopea oligospira'
- 'Loxonema peoriense is recombined as Holopea peoriensis'
- 'Loxonema plebium is recombined as Zygopleura plebiea'
- 'Loxonema rugosa is recombined as Zygopleura rugosa'
- 'Macrocheilus fusiformis is recombined as Sphaerodoma fusiformis'
- 'Macrocheilus intercalaris is recombined as Sphaerodoma intercalaris'
- 'Macrocheilus medialis is recombined as Sphaerodoma medialis'
- 'Macrocheilus micula is recombined as Holopea micula'
- 'Macrocheilus paludinaeformis is recombined as Sphaerodoma paludiniformis'
- 'Macrocheilus pinguis is recombined as Sphaerodoma pinguis'
- 'Macrocheilus subcorpulentus is recombined as Holopea subcorpulenta'
- 'Macrocheilus ventricosus is recombined as Sphaerodoma ventricosa'
- 'Modiola illinoisensis is recombined as Myalina illinoisensis'
- 'Murchisonia lasallensis is recombined as Goniospira lasallensis'
- 'Murchisonia shumardiana is recombined as Holopea shumardana'
- 'Naticella americana belongs to Naticella'
- 'Nucula ventricosa is recombined as Nuculopsis ventricosa'
- 'Nuculites concentrica is recombined as Astartella concentrica'
- 'Orestes nodosus belongs to Orestes'
- 'Orthisina crassa is recombined as Derbya crassa'
- 'Orthoceras rushense is recombined as Protocycloceras rushense'
- 'Pseudomonotis carbonaria is a subjective synonym of Pseudomonotis kansasensis'
- 'Pleurotomaria arkansana belongs to Pleurotomaria'
- 'Pleurotomaria brazoensis is recombined as Orestes brazoensis'
- 'Pleurotomaria depressa is recombined as Trepospira depressa'
- 'Pleurotomaria grayvillensis is recombined as Phanerotrema grayvillense'
- 'Polyphemopsis inornata is recombined as Bulimorpha inornata'
- 'Polyphemopsis melanoides is recombined as Sphaerodoma melanoides'
- 'Productus nebrascensis belongs to Productus'
- 'Productus splendens is recombined as Marginifera splendens'
- 'Schizodus affinis belongs to Schizodus'
- 'Spirifer cameratus belongs to Spirifer'
- 'Spirifer kentuckensis is recombined as Spiriferina kentuckyensis'
- 'Spirifer perplexa is recombined as Squamularia perplexa'
- 'Straparollus angularis is recombined as Euomphalus angularis'
- 'Straparollus similis planus belongs to Straparollus similis'
- 'Stylifer primogenia is recombined as Sphaerodoma primigenia'
- 'Terebratula mormonii is recombined as Hustedia mormoni'
- 'Terebratula subtilita is recombined as Composita subtilita'