Admete gracilior (P. P. Carpenter, 1869) (new combination reference)
Amphissa ventricosa Arnold, 1903 † accepted as Amphissa undata (P. P. Carpenter, 1864) (original description)
Astarte (Crassinella) branneri Arnold, 1903 accepted as Crassinella pacifica (C. B. Adams, 1852) (original description)
Columbella (Anachis) minima Arnold, 1903 † accepted as Zanassarina penicillata (P. P. Carpenter, 1864) (original description)
Delphinoidea coronadoensis Arnold, 1903 accepted as Skenea coronadoensis (Arnold, 1903) (original description)
Dentalium pseudohexagonum Arnold, 1903 † (original description)
Drillia renaudi Arnold, 1903 † accepted as Rhodopetoma renaudi (Arnold, 1903) (original description)
Eupleura muriciformis var. curta Arnold, 1903 † accepted as Eupleura plicata (Reeve, 1844) (original description)
Eupleura muriciformis var. pleistocenensis Arnold, 1903 † accepted as Eupleura triquetra (Reeve, 1844) (original description)
Ivara Arnold, 1903 (original description)
Leda minuta var. praecursor Arnold, 1903 accepted as Nuculana minuta (O. F. Müller, 1776) (original description)
Mangelia (Taranis) strongi Arnold, 1903 † accepted as Pseudotaranis strongi (Arnold, 1903) (original description)
Mangilia (Cythara) branneri Arnold, 1903 † accepted as Ithycythara branneri (Arnold, 1903) † (original description)
Nassa californiana P. P. Carpenter, 1856 sensu Arnold, 1903 accepted as Caesia delosi (Woodring, 1946) (basis of record)
Nassa versicolor var. hooveri Arnold, 1903 † accepted as Phrontis versicolor (C. B. Adams, 1852) (original description)
Nucula (Nucula) suprastriata Arnold, 1903 accepted as Nucula exigua G. B. Sowerby I, 1833 (original description)
Ocenebra keepi Arnold, 1903 † accepted as Paciocinebrina squamulifera (P. P. Carpenter, 1869)  † (original description)
Odostomia (Ivara) Arnold, 1903 accepted as Ivara Arnold, 1903 (original description)
Odostomia (Ivara) terricula Arnold, 1903 accepted as Ivara terricula (Arnold, 1903) (original description)
Paludestrina curta Arnold, 1903 † accepted as Tryonia imitator (Pilsbry, 1899) (original description)
Paludestrina stokesi Arnold, 1903 † accepted as Tryonia stokesi (Arnold, 1903) † (original description)
Pecten (Chlamys) jordani Arnold, 1903 † accepted as Chlamys rubida (Hinds, 1845) (original description)
Pecten (Chlamys) latiauritus var. fragilis Arnold, 1903 † accepted as Leptopecten latiauratus (Conrad, 1837) (original description)
Pecten (Plagioctenium) newsomi Arnold, 1903 † accepted as Argopecten ventricosus (G. B. Sowerby II, 1842) (original description)
Pleurotoma (Borsonia) dalli Arnold, 1903 † accepted as Borsonella omphale Dall, 1919 (original description)
Pleurotoma (Spirotropis) smithi Arnold, 1903 accepted as Antiplanes thalaea (Dall, 1902) (original description)
Polynices (Neverita) recluziana var. alta Arnold, 1903 accepted as Glossaulax reclusiana (Deshayes, 1839) (original description)
Pyrgiscus R. A. Philippi, 1841 (subsequent type designation)
Semele pulchra var. montereyi Arnold, 1903 accepted as Semele venusta (Reeve, 1853) (original description)
Trophon (Boreotrophon) pedroana Arnold, 1903 accepted as Boreotrophon pedroanus (Arnold, 1903) (original description)
Trophon (Boreotrophon) stuarti var. praecursor Arnold, 1903 accepted as Boreotrophon pedroanus (Arnold, 1903) (original description)

California for Columbella (Anachis) minima Arnold, 1903 † 
California for Eupleura muriciformis var. curta Arnold, 1903 † 
California for Mangelia (Taranis) strongi Arnold, 1903 † 
California for Mangilia (Cythara) branneri Arnold, 1903 † 
California for Paludestrina curta Arnold, 1903 † 
California for Paludestrina stokesi Arnold, 1903 † 
California for Pecten (Chlamys) jordani Arnold, 1903 † 
California for Pecten (Plagioctenium) newsomi Arnold, 1903 † 
California for Pleurotoma (Borsonia) dalli Arnold, 1903 † 

 Type locality

 for Paludestrina curta Arnold, 1903 †

San Pedro, California, United States [details]

 Type locality

 for Paludestrina stokesi Arnold, 1903 †

San Pedro, California, United States [details]