Acera Jeffreys, 1867 accepted as Akera O. F. Müller, 1776 (original description)
Acera bullata var. nana Jeffreys, 1867 accepted as Akera bullata O. F. Müller, 1776 (original description)
Aclis gulsonae var. tenuicula Jeffreys, 1867 accepted as Aclis gulsonae (W. Clark, 1850) (original description)
Aclis walleri Jeffreys, 1867 (original description)
Acteon tornatilis var. bullaeformis Jeffreys, 1867 accepted as Acteon tornatilis (Linnaeus, 1758) (original description)
Amphisphyra expansa Jeffreys, 1865 accepted as Diaphana minuta T. Brown, 1827 (original description)
Aporrhais macandreae Jeffreys, 1867 accepted as Aporrhais serresiana (Michaud, 1828) (original description)
Aporrhais pespelecani var. albida Jeffreys, 1867 accepted as Aporrhais pespelecani (Linnaeus, 1758) (original description)
Astarte sulcata var. minor Jeffreys, 1864 accepted as Astarte sulcata (da Costa, 1778) (original description)
Astarte sulcata var. multicostata Jeffreys, 1864 accepted as Astarte sulcata (da Costa, 1778) (original description)
Astarte sulcata var. nana Jeffreys, 1864 (original description)
Astarte sulcata var. paucicostata Jeffreys, 1864 accepted as Astarte sulcata (da Costa, 1778) (original description)
Astarte sulcata var. trigona Jeffreys, 1864 accepted as Astarte sulcata (da Costa, 1778) (original description)
Astarte sulcata var. truncata Jeffreys, 1864 accepted as Astarte sulcata (da Costa, 1778) (original description)
Axinus croulinensis (Jeffreys, 1847) sensu Jeffreys, 1864 accepted as Thyasira obsoleta (A. E. Verrill & K. J. Bush, 1898) (basis of record)
Axinus flexuosus var. polygona Jeffreys, 1864 accepted as Thyasira polygona (Jeffreys, 1864) (original description)
Barleeia rubra var. pallida Jeffreys, 1867 accepted as Barleeia unifasciata (Montagu, 1803) (original description)
Barnea parva var. quadrangula Jeffreys, 1865 accepted as Barnea parva (Pennant, 1777) (original description)
Buccinum humphreysianum var. lactea Jeffreys, 1867 accepted as Buccinum humphreysianum Bennett, 1824 (original description)
Buccinum undatum var. flexuosa Jeffreys, 1867 accepted as Buccinum undatum Linnaeus, 1758 (original description)
Buccinum undatum var. lactea Jeffreys, 1867 accepted as Buccinum undatum Linnaeus, 1758 (original description)
Buccinum undatum var. paupercula Jeffreys, 1867 accepted as Buccinum undatum Linnaeus, 1758 (original description)
Bulla hydatis var. globosa Jeffreys, 1867 accepted as Haminoea hydatis (Linnaeus, 1758) (original description)
Bulla striatula Forbes, 1844 accepted as Retusa mammillata (R. A. Philippi, 1836) (source of synonymy)
Bulla utriculus var. oblonga Jeffreys, 1867 accepted as Roxania utriculus (Brocchi, 1814) (original description)
Cardium echinatum var. expansa Jeffreys, 1864 accepted as Acanthocardia echinata (Linnaeus, 1758) (original description)
Cardium echinatum var. ovata Jeffreys, 1864 accepted as Acanthocardia echinata (Linnaeus, 1758) (original description)
Cardium exiguum var. subquadrata Jeffreys, 1864 accepted as Parvicardium exiguum (Gmelin, 1791) (original description)
Cardium fasciatum var. alba Jeffreys, 1864 accepted as Parvicardium pinnulatum (Conrad, 1831) (original description)
Cardium fasciatum var. globosa Jeffreys, 1864 accepted as Parvicardium pinnulatum (Conrad, 1831) (original description)
Cardium nodosum var. ovata Jeffreys, 1864 accepted as Parvicardium scabrum (R. A. Philippi, 1844) (original description)
Cardium norvegicum var. gibba Jeffreys, 1864 accepted as Laevicardium oblongum gibbum (Jeffreys, 1864) accepted as Laevicardium johnjeffreysi ter Poorten, 2024 (original description)
Cardium norvegicum var. pallida Jeffreys, 1864 accepted as Laevicardium crassum (Gmelin, 1791) (original description)
Cardium norvegicum var. rotunda Jeffreys, 1864 accepted as Laevicardium crassum (Gmelin, 1791) (original description)
Cardium papillosum var. lactea Jeffreys, 1864 accepted as Papillicardium papillosum (Poli, 1791) (original description)
Cerithiopsis barleei Jeffreys, 1867 (original description)
Cerithiopsis tubercularis var. clarkii Jeffreys, 1867 accepted as Cerithiopsis tubercularis (Montagu, 1803) (original description)
Cerithiopsis tubercularis var. nana Jeffreys, 1867 accepted as Costulopsis nana (Jeffreys, 1867) accepted as Cerithiopsis nana Jeffreys, 1867 (original description)
Cerithium bicinctum Jeffreys, 1867 accepted as Cerithiella metula (Lovén, 1846) (original description)
Cerithium perversum var. pallescens Jeffreys, 1867 accepted as Cheirodonta pallescens (Jeffreys, 1867) (original description)
Cerithium reticulatum var. lactescens Jeffreys, 1867 accepted as Bittium lactescens (Jeffreys, 1867) (original description)
Cerithium reticulatum var. simplex Jeffreys, 1867 accepted as Bittium simplex (Jeffreys, 1867) accepted as Bittium lactescens (Jeffreys, 1867) (original description)
Chiton fascicularis var. attenuata Jeffreys, 1865 accepted as Acanthochitona crinita (Pennant, 1777) (original description)
Chiton laevis var. navicula Jeffreys, 1865 accepted as Callochiton septemvalvis (Montagu, 1803) (original description)
Chiton ruber var. oblonga Jeffreys, 1865 accepted as Tonicella rubra (Linnaeus, 1767) accepted as Boreochiton ruber (Linnaeus, 1767) (original description)
Cioniscus Jeffreys, 1869 accepted as Graphis Jeffreys, 1867 (basis of record)
Clione papilionacea Jeffreys, 1869 accepted as Clione limacina (Phipps, 1774) (original description)
Columbella haliaeeti Jeffreys, 1867 accepted as Amphissa acutecostata (R. A. Philippi, 1844) (original description)
Columbella haliaeeti var. albula Jeffreys, 1869 accepted as Amphissa acutecostata (R. A. Philippi, 1844) (original description)
Cyclostrema nitens var. alderi Jeffreys, 1865 accepted as Dikoleps nitens (R. A. Philippi, 1844) (original description)
Cylichna cylindracea var. linearis Jeffreys, 1867 accepted as Cylichna cylindracea (Pennant, 1777) (original description)
Cyprina islandica var. crassior Jeffreys, 1864 accepted as Arctica islandica (Linnaeus, 1767) (original description)
Defrancia leufroyi var. carnosula Jeffreys, 1867 accepted as Leufroyia concinna (Scacchi, 1836) (original description)
Defrancia linearis (Montagu, 1803) accepted as Raphitoma linearis (Montagu, 1803) accepted as Cyrillia linearis (Montagu, 1803) (basis of record)
Defrancia linearis var. aequalis Jeffreys, 1867 accepted as Cyrillia aequalis (Jeffreys, 1867) (original description)
Defrancia purpurea var. oblonga Jeffreys, 1867 accepted as Raphitoma oblonga (Jeffreys, 1867) (original description)
Defrancia reticulata (Renier, 1804) accepted as Raphitoma echinata (Brocchi, 1814) † (basis of record)
Defrancia reticulata var. formosa Jeffreys, 1867 accepted as Raphitoma formosa (Jeffreys, 1867) (original description)
Dentalium entalis var. anulata Jeffreys, 1865 accepted as Antalis entalis (Linnaeus, 1758) (original description)
Dentalium entalis var. infundibulum Jeffreys, 1869 accepted as Antalis entalis (Linnaeus, 1758) (original description)
Doris quadrangulata Jeffreys, 1869 accepted as Acanthodoris pilosa (Abildgaard, 1789) (original description)
Elysia viridis var. olivacea Jeffreys, 1869 accepted as Elysia viridis (Montagu, 1804) (original description)
Emarginula fissura var. elata Jeffreys, 1865 accepted as Emarginula fissura (Linnaeus, 1758) (original description)
Emarginula fissura var. incurva Jeffreys, 1865 accepted as Emarginula fissura (Linnaeus, 1758) (original description)
Emarginula fissura var. subdepressa Jeffreys, 1865 accepted as Emarginula fissura (Linnaeus, 1758) (original description)
Embolus Jeffreys, 1869 accepted as Heliconoides A. d'Orbigny, 1835 (original description)
Eulima distorta (Defrance, 1823) sensu R. A. Philippi, 1836 accepted as Vitreolina philippi (de Rayneval & Ponzi, 1854) (additional source)
Eulima intermedia var. rubrotincta Jeffreys, 1867 accepted as Melanella rubrotincta (Jeffreys, 1867) accepted as Melanella polita (Linnaeus, 1758) (original description)
Fusus antiquus var. alba Jeffreys, 1867 accepted as Neptunea antiqua (Linnaeus, 1758) (original description)
Fusus antiquus var. gracilis Jeffreys, 1867 accepted as Neptunea antiqua (Linnaeus, 1758) (original description)
Fusus antiquus var. striata Jeffreys, 1867 accepted as Neptunea antiqua (Linnaeus, 1758) (original description)
Fusus antiquus var. ventricosa Jeffreys, 1867 accepted as Neptunea antiqua (Linnaeus, 1758) (original description)
Fusus berniciensis var. elegans Jeffreys, 1867 accepted as Troschelia berniciensis (W. King, 1846) (original description)
Fusus branscombi W. Clark, 1849 accepted as Comarmondia gracilis (Montagu, 1803) accepted as Pleurotomoides gracilis (Montagu, 1803) (source of synonymy)
Fusus buchanensis MacGillivray, 1843 accepted as Raphitoma linearis (Montagu, 1803) accepted as Cyrillia linearis (Montagu, 1803) (source of synonymy)
Fusus gracilis var. convoluta Jeffreys, 1867 accepted as Colus gracilis (da Costa, 1778) (original description)
Graphis Jeffreys, 1867 (original description)
Helcion pellucidum (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758 (additional source)
Homalogyra atomus var. vitrea Jeffreys, 1867 accepted as Omalogyra atomus (R. A. Philippi, 1841) (original description)
Hydrobia ulvae var. albida Jeffreys, 1867 accepted as Peringia ulvae (Pennant, 1777) (original description)
Lachesis minima var. pallescens Jeffreys, 1867 accepted as Chauvetia brunnea (Donovan, 1804) (original description)
Lacuna pallidula var. albescens Jeffreys, 1865 accepted as Lacuna pallidula (da Costa, 1778) (original description)
Lacuna puteolus var. clausa Jeffreys, 1865 accepted as Lacuna parva (da Costa, 1778) (original description)
Lacuna puteolus var. conica Jeffreys, 1865 accepted as Lacuna parva (da Costa, 1778) (original description)
Lacuna puteolus var. expansa Jeffreys, 1865 accepted as Lacuna parva (da Costa, 1778) (original description)
Lacuna puteolus var. lactea Jeffreys, 1865 accepted as Lacuna parva (da Costa, 1778) (original description)
Lacuna tenella Jeffreys, 1869 accepted as Benthonella tenella (Jeffreys, 1869) (original description)
Lamellaria perspicua var. lata Jeffreys, 1867 accepted as Lamellaria latens (O. F. Müller, 1776) (original description)
Lasaea rubra var. pallida Jeffreys, 1864 accepted as Lasaea rubra (Montagu, 1803) (original description)
Leda minuta var. brevirostris Jeffreys, 1864 accepted as Nuculana minuta (O. F. Müller, 1776) (original description)
Lepton nitidum var. lineolata Jeffreys, 1864 accepted as Hemilepton nitidum (W. Turton, 1822) (original description)
Lepton nitidum var. pisidialis Jeffreys, 1864 accepted as Hemilepton nitidum (W. Turton, 1822) (original description)
Lima elliptica Jeffreys, 1864 accepted as Limatula gwyni (Sykes, 1903) (original description)
Limopsis borealis Jeffreys, 1869 accepted as Paracratis borealis (Jeffreys, 1869) (original description)
Littorina litorea var. brevicula Jeffreys, 1865 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina obtusata var. aestuarii Jeffreys, 1869 accepted as Littorina obtusata (Linnaeus, 1758) (original description)
Littorina obtusata var. compacta Jeffreys, 1865 accepted as Littorina fabalis (W. Turton, 1825) (original description)
Littorina obtusata var. ornata Jeffreys, 1865 accepted as Littorina obtusata (Linnaeus, 1758) (original description)
Littorina rudis var. compressa Jeffreys, 1865 accepted as Littorina compressa Jeffreys, 1865 (original description)
Littorina rudis var. globosa Jeffreys, 1865 accepted as Littorina saxatilis (Olivi, 1792) (original description)