Opinions from R. S. Lull and N. E. Wright 1942
- 'Anatosaurus belongs to Hadrosaurinae'
- 'Anatosaurus copei belongs to Anatosaurus'
- 'Cheneosaurinae belongs to Hadrosauridae'
- 'Cheneosaurus belongs to Cheneosaurinae'
- 'Cheneosaurus tolmanensis belongs to Cheneosaurus'
- 'Cionodon is a nomen nudum'
- 'Cionodon arctatus is a nomen nudum'
- 'Cionodon stenopsis is a nomen nudum'
- 'Claorhynchus is a nomen nudum'
- 'Claorhynchus trihedrus is a nomen nudum'
- 'Claosaurus belongs to Hadrosaurinae'
- 'Claosaurus affinis is a nomen nudum'
- 'Claosaurus annectens is recombined as Anatosaurus annectens'
- 'Corythosaurus belongs to Lambeosaurinae'
- 'Corythosaurus bicristatus belongs to Corythosaurus'
- 'Corythosaurus brevicristatus belongs to Corythosaurus'
- 'Corythosaurus casuarius belongs to Corythosaurus'
- 'Corythosaurus excavatus belongs to Corythosaurus'
- 'Corythosaurus frontalis belongs to Corythosaurus'
- 'Diclonius is a nomen dubium'
- 'Diclonius calamarius is a nomen dubium'
- 'Diclonius pentagonus is a nomen dubium'
- 'Diclonius perangulatus is a nomen dubium'
- 'Dysganus is a nomen dubium'
- 'Dysganus bicarinatus is a nomen nudum'
- 'Dysganus encaustus is a nomen dubium'
- 'Dysganus haydenianus is a nomen dubium'
- 'Dysganus peiganus is a nomen dubium'
- 'Edmontosaurus belongs to Hadrosaurinae'
- 'Edmontosaurus regalis belongs to Edmontosaurus'
- 'Gryposaurus is a subjective synonym of Kritosaurus'
- 'Gryposaurus notabilis is recombined as Kritosaurus notabilis'
- 'Hadrosauridae belongs to Ornithopoda'
- 'Hadrosaurinae belongs to Hadrosauridae'
- 'Hadrosaurus belongs to Hadrosaurinae'
- 'Hadrosaurus agilis is recombined as Claosaurus agilis'
- 'Hadrosaurus breviceps is recombined as Kritosaurus breviceps'
- 'Hadrosaurus foulkii belongs to Hadrosaurus'
- 'Hadrosaurus minor is a nomen nudum'
- 'Hadrosaurus tripos belongs to Hadrosaurus' according to E. D. Cope 1869
- 'Hadrosaurus tripos is a nomen nudum'
- 'Hypacrosaurus belongs to Lambeosaurinae'
- 'Hypacrosaurus altispinus belongs to Hypacrosaurus'
- 'Hypsibema is a nomen nudum'
- 'Hypsibema crassicauda is a nomen nudum'
- 'Kritosaurus belongs to Hadrosaurinae'
- 'Kritosaurus incurvimanus belongs to Kritosaurus'
- 'Kritosaurus navajovius belongs to Kritosaurus'
- 'Lambeosaurinae belongs to Hadrosauridae'
- 'Lambeosaurus belongs to Lambeosaurinae'
- 'Lambeosaurus clavinitialis belongs to Lambeosaurus'
- 'Lambeosaurus lambei belongs to Lambeosaurus'
- 'Lambeosaurus magnicristatum is corrected as Lambeosaurus magnicristatus and belongs to Lambeosaurus'
- 'Ornithotarsus belongs to Hadrosaurinae'
- 'Ornithotarsus immanis belongs to Ornithotarsus'
- 'Parasaurolophus belongs to Lambeosaurinae'
- 'Parasaurolophus tubicen belongs to Parasaurolophus'
- 'Parasaurolophus walkeri belongs to Parasaurolophus'
- 'Pneumatoarthrus belongs to Theropoda'
- 'Pneumatoarthrus peloreus belongs to Pneumatoarthrus'
- 'Procheneosaurus belongs to Cheneosaurinae'
- 'Prosaurolophus belongs to Saurolophinae'
- 'Prosaurolophus maximus belongs to Prosaurolophus'
- 'Pteropelyx is a nomen dubium'
- 'Pteropelyx grallipes is a nomen dubium'
- 'Saurolophinae belongs to Hadrosauridae'
- 'Saurolophus belongs to Saurolophinae'
- 'Saurolophus osborni belongs to Saurolophus'
- 'Stephanosaurus intermedius is recombined as Corythosaurus intermedius'
- 'Tetragonosaurus is a subjective synonym of Procheneosaurus'
- 'Tetragonosaurus cranibrevis is recombined as Procheneosaurus cranibrevis'
- 'Tetragonosaurus erectofrons is recombined as Procheneosaurus erectofrons'
- 'Thespesius belongs to Hadrosaurinae'
- 'Thespesius edmontoni is recombined as Anatosaurus edmontoni'
- 'Thespesius occidentalis belongs to Thespesius'
- 'Thespesius saskatchewanensis is recombined as Anatosaurus saskatchewanensis'
- 'Trachodon belongs to Hadrosaurinae'
- 'Trachodon (Pteropelyx) altidens belongs to Trachodon (Pteropelyx)' according to L. M. Lambe 1902
- 'Trachodon (Pteropelyx) altidens is recombined as Procheneosaurus altidens'
- 'Trachodon marginatus is a nomen dubium'
- 'Trachodon selwyni is a nomen dubium'
- 'Trachodon longiceps is recombined as Anatosaurus longiceps'
- 'Trachodon mirabilis belongs to Trachodon'
- 'Trachodontidae is a subjective synonym of Hadrosauridae'