Agnomyax R. B. Stewart, 1930 † (original description)
Agnomyax monilifer (Gabb, 1864) † (basis of record)
Arcinella Oken, 1815 accepted as Cardita Bruguière, 1792 (subsequent type designation)
Bathytormus R. B. Stewart, 1930 (original description)
Calorhadia R. B. Stewart, 1930 † accepted as Yoldia (Calorhadia) R. B. Stewart, 1930 † represented as Yoldia Møller, 1842 (original description)
Calorhadia (Litorhadia) R. B. Stewart, 1930 † accepted as Litorhadia R. B. Stewart, 1930 † (original description)
Calorhadia pharcida (Dall, 1898) † accepted as Yoldia (Calorhadia) pharcida (Dall, 1898) † represented as Yoldia pharcida (Dall, 1898) † (basis of record)
Cardium (Eucardium) P. Fischer, 1887 accepted as Acanthocardia J. E. Gray, 1851 (subsequent type designation)
Claibornites R. B. Stewart, 1930 † (original description)
Claibornites (Codalucina) R. B. Stewart, 1930 † represented as Claibornites R. B. Stewart, 1930 † (original description)
Claibornites (Saxolucina) R. B. Stewart, 1930 † accepted as Saxolucina R. B. Stewart, 1930 † (original description)
Claibornites rotunda (I. Lea, 1833) † (new combination reference)
Corbula (Caryocorbula) hornii Gabb, 1864 † accepted as Caryocorbula hornii (Gabb, 1864) † (basis of record)
Crassatella tuscana (Gabb, 1864) † (basis of record)
Crassatella uvasana mathewsonii (Gabb, 1864) † (basis of record)
Cucullaeinae R. B. Stewart, 1930 accepted as Cucullaeidae R. B. Stewart, 1930 (original description)
Eophysema R. B. Stewart, 1930 † (original description)
Eucrassatella (Hybolophus) R. B. Stewart, 1930 accepted as Hybolophus R. B. Stewart, 1930 (original description)
Fraginae R. B. Stewart, 1930 (original description)
Glyptoactis R. B. Stewart, 1930 (original description)
Gouldiidae R. B. Stewart, 1930 accepted as Gouldiinae R. B. Stewart, 1930 (original description)
Halonanus R. B. Stewart, 1930 † accepted as Pachecoa G. D. Harris, 1919 † (original description)
Halonanus pulchra (Gabb, 1860) † accepted as Pachecoa pulchra (Gabb, 1860) † (basis of record)
Lembulus translucidus (Gabb, 1864) † (basis of record)
Limopsis transversa Gabb, 1864 † (additional source)
Linearia multicostata (Gabb, 1869) † (basis of record)
Loripinus (Eophysema) R. B. Stewart, 1930 accepted as Eophysema R. B. Stewart, 1930 † (original description)
Loripinus (Pegophysema) R. B. Stewart, 1930 accepted as Pegophysema R. B. Stewart, 1930 (original description)
Lucina Bruguière, 1797 (additional source)
Lucina (Quasilucina) R. B. Stewart, 1930 † accepted as Lucina Bruguière, 1797 (original description)
Microcallista R. B. Stewart, 1930 † accepted as Callista (Microcallista) R. B. Stewart, 1930 † represented as Callista Poli, 1791 (original description)
Microcallista conradiana (Gabb, 1864) † accepted as Callista conradiana (Gabb, 1864) † (basis of record)
Miltha (Plastomiltha) R. B. Stewart, 1930 † accepted as Plastomiltha R. B. Stewart, 1930 † (original description)
Myrtea gabbi R. B. Stewart, 1930 † (original description)
Neithea (Neitheops) R. B. Stewart, 1930 † represented as Neithea Drouët, 1825 † (original description)
Nemocardium linteum (Conrad, 1855) † (new combination reference)
Noetiidae R. B. Stewart, 1930 (original description)
Noetiinae R. B. Stewart, 1930 accepted as Noetiidae R. B. Stewart, 1930 (original description)
Palliolum (Delectopecten) R. B. Stewart, 1930 † accepted as Delectopecten R. B. Stewart, 1930 (original description)
Parallelodon (Nanonavis) R. B. Stewart, 1930 † accepted as Nanonavis R. B. Stewart, 1930 † (original description)
Periploma whitneyi (Gabb, 1864) † (basis of record)
Periplomya inequilaterialis (Gabb, 1864) † (basis of record)
Periplomya tryoniana (Gabb, 1864) † (basis of record)
Pitarinae R. B. Stewart, 1930 accepted as Callocardiinae Dall, 1895 (original description)
Plagiocardium (Schedocardia) R. B. Stewart, 1930 † accepted as Schedocardia R. B. Stewart, 1930 † (original description)
Portlandia (Portlandella) R. B. Stewart, 1930 † accepted as Portlandia Mörch, 1857 (original description)
Protocardia translucida (Gabb, 1869) † (basis of record)
Rhectomyax R. B. Stewart, 1930 † (original description)
Rhectomyax undulata (Gabb, 1864) † (basis of record)
Solena (Eosolen) R. B. Stewart, 1930 † represented as Solena Mörch, 1853 (original description)
Stereomactra Stewart, 1930 † (original description)
Trachycardiinae R. B. Stewart, 1930 (original description)
Trachycardium (Agnocardia) R. B. Stewart, 1930 † accepted as Agnocardia R. B. Stewart, 1930 † (original description)
Trachycardium (Dallocardia) R. B. Stewart, 1930 accepted as Dallocardia R. B. Stewart, 1930 (original description)
Trachycardium (Mexicardia) R. B. Stewart, 1930 accepted as Mexicardia R. B. Stewart, 1930 (original description)
Trachycardium (Phlogocardia) R. B. Stewart, 1930 accepted as Phlogocardia R. B. Stewart, 1930 (original description)
Trapezium Megerle von Mühlfeld, 1811 (subsequent type designation)
Trapezium (Schedotrapezium) carinatum Gabb, 1864 † accepted as Schedotrapezium carinatum (Gabb, 1864) † (new combination reference)
Trigonia evansana var. oregona [sic] † accepted as Notoscabrotrigonia oregana (E. L. Packard, 1921) † (basis of record)
Trigoniocardia (Americardia) R. B. Stewart, 1930 accepted as Americardia R. B. Stewart, 1930 (original description)
Turnus plenus Gabb, 1864 † (additional source)
Venerella (Compsomyax) R. B. Stewart, 1930 † accepted as Compsomyax R. B. Stewart, 1930 (original description)
Venericardia (Venericor) R. B. Stewart, 1930 † accepted as Venericor R. B. Stewart, 1930 † (original description)
Venericardia hornii calafia R. B. Stewart, 1930 † (original description)
Venus lenticularis Gabb, 1864 † (status source)
Volsella siskiyouensis (Gabb, 1864) † accepted as Modiolus siskiyouensis Gabb, 1864 † (basis of record)
Volsella telea R. B. Stewart, 1930 † accepted as Modiolus teleus (R. B. Stewart, 1930) † (original description)

California for Venericardia hornii calafia R. B. Stewart, 1930 †