Achatina solida Say, 1825 accepted as Liguus fasciatus (O. F. Müller, 1774) (original description)
Alasmodonta ambigua Say, 1825 accepted as Simpsonaias ambigua (Say, 1825) (original description)
Anculotus Conrad, 1834 accepted as Anculosa Say, 1821 accepted as Leptoxis Rafinesque, 1819 (basis of record)
Bulimus multilineatus Say, 1825 accepted as Mesembrinus multilineatus (Say, 1825) (original description)
Cyclostoma dentatum Say, 1825 accepted as Parachondria dentata (Say, 1825) (original description)
Fusus fluvialis Say, 1825 accepted as Io fluvialis (Say, 1825) (original description)
Helix egena Say, 1825 accepted as Euconulus fulvus egenus (Say, 1825) (original description)
Helix fallax Say, 1825 accepted as Triodopsis fallax (Say, 1825) (original description)
Lymnaea heterostropha Say, 1825 accepted as Haitia acuta (Draparnaud, 1805) accepted as Physella acuta (Draparnaud, 1805) (original description)
Lymnaeus modicellus Say, 1825 accepted as Galba modicella (Say, 1825) (original description)
Lymneus galbanus Say, 1825 accepted as Galba galbana (Say, 1825) (original description)
Lymneus modicellus Say, 1825 accepted as Galba modicella (Say, 1825) (original description)
Lymneus obrussus Say, 1825 accepted as Galba obrussa (Say, 1825) (original description)
Lymneus pinguis Say, 1825 accepted as Catascopia catascopium (Say, 1817) accepted as Ladislavella catascopium (Say, 1817) (original description)
Melania proxima Say, 1825 accepted as Elimia proxima (Say, 1825) (original description)
Melania simplex Say, 1825 accepted as Elimia simplex (Say, 1825) (original description)
Melania subglobosa Say, 1825 accepted as Leptoxis subglobosa (Say, 1825) (original description)
Paludina subglobosa Say, 1825 accepted as Birgella subglobosa (Say, 1825) (original description)
Physa ancillaria Say, 1825 accepted as Physella ancillaria (Say, 1825) accepted as Physella gyrina (Say, 1821) (original description)
Pirena scalariformis Say, 1825 accepted as Cerithideopsis scalariformis (Say, 1825) (original description)
Pupa fallax Say, 1825 accepted as Merdigera obscura (O. F. Müller, 1774) (original description)
Unio subtentus Say, 1825 accepted as Ptychobranchus subtentus (Say, 1825) (original description)

Floridian for Pirena scalariformis Say, 1825 
New Guinea for Melania papuensis Quoy & Gaimard, 1834 
New York for Lymneus modicellus Say, 1825 
Sulawesi for Melania uniformis Quoy & Gaimard, 1834