Opinions from E. Billings 1866
- 'Athyris lara belongs to Athyris'
- 'Bellerophon bilobatus belongs to Bellerophon'
- 'Bellerophon canadensis belongs to Bellerophon'
- 'Bellerophon fraternus belongs to Bellerophon'
- 'Bellerophon solitarius belongs to Bellerophon'
- 'Cheirurus numator belongs to Cheirurus'
- 'Conocardium elegantulum belongs to Conocardium'
- 'Conularia splendida belongs to Conularia'
- 'Cyclonema bellula belongs to Cyclonema'
- 'Cyclonema communis belongs to Cyclonema'
- 'Cyclonema decora belongs to Cyclonema'
- 'Cyclonema humilis belongs to Cyclonema'
- 'Cyclonema mediocris belongs to Cyclonema'
- 'Cyclonema percingulatum belongs to Cyclonema'
- 'Cyrtodonta emma belongs to Cyrtodonta'
- 'Cyrtodonta plebia belongs to Cyrtodonta'
- 'Cyrtolites desiderata belongs to Cyrtolites'
- 'Cyrtolites pannosus belongs to Cyrtolites'
- 'Dionide perplexa belongs to Dionide'
- 'Ischyrinia plicata belongs to Ischyrinia'
- 'Ischyrinia winchelli belongs to Ischyrinia'
- 'Loxonema aculeata belongs to Loxonema'
- 'Murchisonia funata belongs to Murchisonia'
- 'Murchisonia modesta belongs to Murchisonia'
- 'Murchisonia multivolvis belongs to Murchisonia'
- 'Murchisonia papillosa belongs to Murchisonia'
- 'Murchisonia rugosum belongs to Murchisonia'
- 'Murchisonia teretiformis belongs to Murchisonia'
- 'Murchisonia turricula belongs to Murchisonia'
- 'Murchisonia varians belongs to Murchisonia'
- 'Orthis aequivalva is corrected as Orthis uberis and belongs to Orthis'
- 'Orthis sola belongs to Orthis'
- 'Orthoceras anticostense is corrected as Orthoceras anticostiense and belongs to Orthoceras'
- 'Orthoceras bellatulum belongs to Orthoceras'
- 'Orthoceras infelix belongs to Orthoceras'
- 'Orthoceras propinquum is replaced by Orthoceras fulgar'
- 'Orthoceras raptor belongs to Orthoceras'
- 'Pentamerus reversus is recombined as Camerella reversa'
- 'Pleurotomaria circe belongs to Pleurotomaria'
- 'Pleurotomaria cryptata belongs to Pleurotomaria'
- 'Pleurotomaria sybellina belongs to Pleurotomaria'
- 'Pleurotomaria thalia is recombined as Cyclonema thalia'
- 'Pterinea thisbe belongs to Pterinea'
- 'Ptilodictya canadensis belongs to Ptilodictya'
- 'Ptilodictya fragilis belongs to Ptilodictya'
- 'Ptilodictya nitidula belongs to Ptilodictya'
- 'Rhynchonella janea belongs to Rhynchonella'
- 'Rhynchonella vicina belongs to Rhynchonella'
- 'Subulites notatus belongs to Subulites'
- 'Subulites richardsoni belongs to Subulites'
- 'Tubipora catenularia is recombined as Halysites catenularia'