Buccinum macula Montagu, 1803 accepted as Nassarius incrassatus (Strøm, 1768) accepted as Tritia incrassata (Strøm, 1768) (original description)
Buccinum minimum Montagu, 1803 accepted as Chauvetia brunnea (Donovan, 1804) (original description)
Bulla catena Montagu, 1803 accepted as Philine catena (Montagu, 1803) (original description)
Bulla diaphana Montagu, 1803 accepted as Trivia arctica (Pulteney, 1799) (original description)
Bulla haliotoidea Montagu, 1803 accepted as Lamellaria perspicua (Linnaeus, 1758) (original description)
Bulla obtusa Montagu, 1803 accepted as Retusa obtusa (Montagu, 1803) (original description)
Bulla plumula Montagu, 1803 accepted as Berthella plumula (Montagu, 1803) (original description)
Bulla umbilicata Montagu, 1803 accepted as Retusa umbilicata (Montagu, 1803) (original description)
Cardium arcuatum Montagu, 1803 accepted as Lucinella divaricata (Linnaeus, 1758) (original description)
Cardium elongatum Montagu, 1803 accepted as Parvicardium pinnulatum (Conrad, 1831) (original description)
Cardium nodosum Montagu, 1803 sensu W. Turton, 1822 accepted as Parvicardium scabrum (Philippi, 1844) (original description)
Cardium rubrum Montagu, 1803 accepted as Lasaea rubra (Montagu, 1803) (original description)
Chiton septemvalvis Montagu, 1803 accepted as Callochiton septemvalvis (Montagu, 1803) (original description)
Cypraea bullata Montagu, 1803 accepted as Trivia arctica (Pulteney, 1799) (original description)
Cypraea voluta Montagu, 1803 accepted as Erato voluta (Montagu, 1803) (original description)
Dentalium glabrum Montagu, 1803 accepted as Caecum glabrum (Montagu, 1803) (original description)
Dentalium trachea Montagu, 1803 accepted as Caecum trachea (Montagu, 1803) (original description)
Dexiospira corrugata (Montagu, 1803) accepted as Spirorbis (Spirorbis) rupestris Gee & Knight-Jones, 1962 (original description)
Donax castaneus Montagu, 1803 accepted as Ervilia castanea (Montagu, 1803) (original description)
Donax complanatus Montagu, 1803 accepted as Donax variegatus (Gmelin, 1791) (original description)
Donax plebeius Montagu, 1803 accepted as Donacilla cornea (Poli, 1791) (original description)
Helix depressa Montagu, 1803 accepted as Skeneopsis planorbis (O. Fabricius, 1780) (original description)
Helix labiosa Montagu, 1803 accepted as Rissoa membranacea (J. Adams, 1800) (original description)
Helix lacuna Montagu, 1803 accepted as Lacuna parva (da Costa, 1778) (original description)
Helix petraea Montagu, 1803 accepted as Melarhaphe neritoides (Linnaeus, 1758) (original description)
Helix subcarinata Montagu, 1803 accepted as Tornus subcarinatus (Montagu, 1803) (original description)
Mactra hians Montagu, 1803 accepted as Lutraria oblonga (Gmelin, 1791) (original description)
Mactra tenuis Montagu, 1803 accepted as Abra tenuis (Montagu, 1803) (original description)
Mactra triangularis Montagu, 1803 accepted as Goodallia triangularis (Montagu, 1803) (original description)
Murex adversus Montagu, 1803 accepted as Marshallora adversa (Montagu, 1803) (original description)
Murex attenuatus Montagu, 1803 accepted as Mangelia attenuata (Montagu, 1803) (original description)
Murex gracilis Montagu, 1803 accepted as Comarmondia gracilis (Montagu, 1803) (original description)
Murex linearis Montagu, 1803 accepted as Raphitoma linearis (Montagu, 1803) (original description)
Murex muricatus Montagu, 1803 accepted as Trophonopsis muricata (Montagu, 1803) (original description)
Murex nebula Montagu, 1803 accepted as Bela nebula (Montagu, 1803) (original description)
Murex purpureus Montagu, 1803 accepted as Raphitoma purpurea (Montagu, 1803) (original description)
Murex reticulatus (da Costa, 1778) accepted as Bittium reticulatum (da Costa, 1778) (basis of record)
Murex rufus Montagu, 1803 accepted as Propebela rufa (Montagu, 1803) (original description)
Murex septangularis Montagu, 1803 accepted as Haedropleura septangularis (Montagu, 1803) (original description)
Murex tubercularis Montagu, 1803 accepted as Cerithiopsis tubercularis (Montagu, 1803) (original description)
Murex turricula Montagu, 1803 accepted as Propebela turricula (Montagu, 1803) (original description)
Mya bidentata Montagu, 1803 accepted as Kurtiella bidentata (Montagu, 1803) (original description)
Mya distorta Montagu, 1803 accepted as Thracia distorta (Montagu, 1803) (original description)
Mya inaequivalvis Montagu, 1803 accepted as Corbula gibba (Olivi, 1792) (original description)
Mya pholadia Montagu, 1803 accepted as Rocellaria dubia (Pennant, 1777) (original description)
Mya suborbicularis Montagu, 1803 accepted as Kellia suborbicularis (Montagu, 1803) (original description)
Mytilus discrepans Montagu, 1803 accepted as Musculus discors (Linnaeus, 1767) (original description)
Mytilus praecisus Montagu, 1803 accepted as Hiatella arctica (Linnaeus, 1767) (original description)
Patella apertura Montagu, 1803 accepted as Diodora graeca (Linnaeus, 1758) (original description)
Patella bimaculata Montagu, 1803 accepted as Ansates pellucida (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758 (original description)
Protula tubularia (Montagu, 1803) (original description)
Sabella compressa Montagu, 1803 (original description)
Sabella curta Montagu, 1803 (original description)
Sabella setiformis Montagu, 1803 (original description)
Sabella subcylindrica Montagu, 1803 (original description)
Serpula carinata Montagu, 1803 accepted as Spirorbis carinatus Daudin, 1800 (original description)
Serpula cornea Adams, 1800 accepted as Janua (Dexiospira) spirillum lucida (Montagu, 1803) accepted as Circeis spirillum (Linnaeus, 1758) (additional source)
Serpula heterostropha Montagu, 1803 accepted as Janua heterostropha (Montagu, 1803) (original description)
Serpula lobata Montagu, 1803 (original description)
Serpula lucida Montagu, 1803 accepted as Circeis spirillum (Linnaeus, 1758) (original description)
Serpula minuta Montagu, 1803 accepted as Janua pagenstecheri (Quatrefages, 1866) accepted as Janua heterostropha (Montagu, 1803) (original description)
Serpula reversa Montagu, 1803 (original description)
Serpula sinistrorsa Montagu, 1803 accepted as Spirorbis spirillum (Linnaeus, 1758) accepted as Circeis spirillum (Linnaeus, 1758) (original description)
Serpula tubularia Montagu, 1803 accepted as Protula tubularia (Montagu, 1803) (original description)
Solen novaculus Montagu, 1803 accepted as Ensis siliqua (Linnaeus, 1758) (original description)
Solen pinna Montagu, 1803 accepted as Pandora pinna (Montagu, 1803) (original description)
Solen squamosus Montagu, 1803 accepted as Lepton squamosum (Montagu, 1803) (original description)
Tellina flexuosa Montagu, 1803 accepted as Thyasira flexuosa (Montagu, 1803) (original description)
Tellina radula Montagu, 1803 accepted as Lucinoma borealis (Linnaeus, 1767) (original description)
Tellina rotundata Montagu, 1803 accepted as Diplodonta rotundata (Montagu, 1803) (original description)
Trochus tenuis Montagu, 1803 accepted as Calliostoma granulatum (Born, 1778) (original description)
Trochus tumidus Montagu, 1803 accepted as Gibbula tumida (Montagu, 1803) (original description)
Trochus umbilicatus Montagu, 1803 accepted as Gibbula umbilicalis (da Costa, 1778) accepted as Steromphala umbilicalis (da Costa, 1778) (original description)
Turbo canalis Montagu, 1803 accepted as Lacuna vincta (Montagu, 1803) (original description)
Turbo cingillus Montagu, 1803 accepted as Cingula trifasciata (J. Adams, 1800) (original description)
Turbo crassior Montagu, 1803 accepted as Lacuna crassior (Montagu, 1803) (original description)
Turbo decussatus Montagu, 1803 accepted as Parthenina decussata (Montagu, 1803) (original description)
Turbo elegantissimus Montagu, 1803 accepted as Turbonilla lactea (Linnaeus, 1758) (original description)
Turbo jugosus Montagu, 1803 accepted as Littorina saxatilis (Olivi, 1792) (original description)
Turbo nitidissimus Montagu, 1803 accepted as Ebala nitidissima (Montagu, 1803) (original description)
Turbo nivosus Montagu, 1803 accepted as Jordaniella nivosa (Montagu, 1803) (original description)
Turbo pallidus Montagu, 1803 (original description)
Turbo plicatus Montagu, 1803 accepted as Odostomia plicata (Montagu, 1803) (original description)
Turbo punctura Montagu, 1803 accepted as Alvania punctura (Montagu, 1803) (original description)
Turbo quadrifasciatus Montagu, 1803 accepted as Lacuna vincta (Montagu, 1803) (original description)
Turbo reticulatus Montagu, 1803 accepted as Alvania beanii (Hanley in Thorpe, 1844) (original description)
Turbo semicostatus Montagu, 1803 accepted as Onoba semicostata (Montagu, 1803) (original description)
Turbo spiralis Montagu, 1803 accepted as Spiralinella spiralis (Montagu, 1803) (original description)
Turbo striatulus Montagu, 1803 accepted as Alvania carinata (da Costa, 1778) (original description)
Turbo subtruncatus Montagu, 1803 accepted as Truncatella subcylindrica (Linnaeus, 1767) (original description)
Turbo subumbilicatus Montagu, 1803 accepted as Peringia ulvae (Pennant, 1777) (original description)
Turbo tenebrosus Montagu, 1803 accepted as Littorina saxatilis (Olivi, 1792) (original description)
Turbo truncatus Montagu, 1803 accepted as Truncatella subcylindrica (Linnaeus, 1767) (original description)
Turbo unicus Montagu, 1803 accepted as Graphis albida (Kanmacher, 1798) (original description)
Turbo unidentatus Montagu, 1803 accepted as Odostomia unidentata (Montagu, 1803) (original description)
Turbo unifasciatus Montagu, 1803 accepted as Barleeia unifasciata (Montagu, 1803) (original description)
Turbo ventrosus Montagu, 1803 accepted as Ecrobia ventrosa (Montagu, 1803) (original description)
Turbo vinctus Montagu, 1803 accepted as Lacuna vincta (Montagu, 1803) (original description)
Turbo vitreus Montagu, 1803 accepted as Hyala vitrea (Montagu, 1803) (original description)
Venus minima Montagu, 1803 accepted as Gouldia minima (Montagu, 1803) (original description)