Acanthohaustorius intermedius Bousfield, 1965 (basis of record)
Actinothoe modesta (Verrill, 1866) (basis of record)
Aeginella spinosa Boeck, 1861 (additional source)
Aeginina longicornis (Krøyer, 1843) (additional source)
Aequorea aequorea (Forsskål, 1775) accepted as Aequorea forskalea Péron & Lesueur, 1810 (additional source)
Aetea recta accepted as Aetea sica (Couch, 1844) (basis of record)
Aeverrillia armata (Verrill, 1873) (basis of record)
Aglaophamus verrilli (McIntosh, 1885) (additional source)
Alcyonidium gelatinosum (Linnaeus, 1761) (additional source)
Alcyonidium polyoum (Hassall, 1841) (additional source)
Alcyonidium verrilli Osburn, 1912 (basis of record)
Almyracuma proximoculi Jones & Burbanck, 1959 (basis of record)
Amaroucium constellatum Verrill, 1871 accepted as Aplidium constellatum (Verrill, 1871) (additional source)
Amastigos caperatus Ewing & Dauer, 1981 (basis of record)
Amathia vidovici (Heller, 1867) (additional source)
Ampelisca verrilli Mills, 1967 (basis of record)
Amphicteis floridus Hartman, 1951 accepted as Hobsonia florida (Hartman, 1951) (additional source)
Amphipholis abdita Verrill, 1871 accepted as Amphioplus (Amphioplus) abditus (Verrill, 1871) (basis of record)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Amphitrite figulus (Dalyell, 1853) represented as Neoamphitrite figulus (Dalyell, 1853) (additional source)
Amphitrite ornata (Leidy, 1855) (additional source)
Ampithoe valida S.I. Smith, 1873 (additional source)
Anadara ovalis (Bruguière, 1789) accepted as Lunarca ovalis (Bruguière, 1789) (basis of record)
Anguinella palmata Van Beneden, 1845 (additional source)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Arbacia punctulata (Lamarck, 1816) (basis of record)
Arenaeus cribrarius (Lamarck, 1818) (basis of record)
Arenicola brasiliensis Nonato, 1958 (basis of record)
Arenicola cristata Stimpson, 1856 (additional source)
Armases cinereum (Bosc, 1801) (basis of record)
Asabellides oculata (Webster, 1879) accepted as Ampharete oculata (Webster, 1879) (additional source)
Aselomaris michaeli Berrill, 1948 accepted as Pachycordyle michaeli (Berrill, 1948) (additional source)
Astrangia poculata (Ellis & Solander, 1786) (basis of record)
Astropecten americanus (Verrill, 1880) (basis of record)
Astropecten articulatus (Say, 1825) (basis of record)
Austrobdella rapax (Verrill, 1873) (basis of record)
Autolytus prismaticus (O.F. Müller, 1776) accepted as Proceraea prismatica (O.F. Müller, 1776) (additional source)
Balanus amphitrite Darwin, 1854 accepted as Amphibalanus amphitrite (Darwin, 1854) (additional source)
Balanus balanus (Linnaeus, 1758) (additional source)
Balanus eburneus Gould, 1841 accepted as Amphibalanus eburneus (Gould, 1841) (additional source)
Balanus improvisus Darwin, 1854 accepted as Amphibalanus improvisus (Darwin, 1854) (additional source)
Barentsia laxa Kirkpatrick, 1890 (basis of record)
Barentsia major Hincks, 1889 (basis of record)
Batea catharinensis Müller, 1865 (basis of record)
Bdelloura candida (Girard, 1850) (basis of record)
Beroe cucumis Mertens, 1833 accepted as Hormiphora cucumis (Mertens, 1833) (additional source)
Biffarius biformis (Biffar, 1971) (basis of record)
Bittiolum varium (L. Pfeiffer, 1840) (basis of record)
Bittium alternatum (Say, 1822) accepted as Bittiolum alternatum (Say, 1822) (basis of record)
Botrylloides diegense Ritter & Forsyth, 1917 accepted as Botrylloides diegensis Ritter & Forsyth, 1917 (basis of record)
Bougainvillia rugosa Clarke, 1882 (additional source)
Bowerbankia imbricata (Adams, 1798) accepted as Amathia imbricata (Adams, 1800) (additional source)
Branchellion torpedinis Savigny, 1822 (additional source)
Branchiostoma caribaeum Sundevall, 1853 (additional source)
Bugula fulva Ryland, 1960 accepted as Bugulina fulva (Ryland, 1960) (additional source)
Bugula simplex Hincks, 1886 accepted as Bugulina simplex (Hincks, 1886) (additional source)
Busycotypus canaliculatus (Linnaeus, 1758) (basis of record)
Byblis serrata S.I. Smith, 1873 (additional source)
Callinectes sapidus Rathbun, 1896 (additional source)
Callinectes similis Williams, 1966 (basis of record)
Calliostoma bairdii A. E. Verrill & S. Smith, 1880 (basis of record)
Callipallene brevirostris (Johnston, 1837) (additional source)
Caprella equilibra Say, 1818 (additional source)
Caprella linearis (Linnaeus, 1767) (additional source)
Caprella septentrionalis Krøyer, 1838 (additional source)
Caprella unica Mayer, 1903 (basis of record)
Carcinonemertes carcinophila (Kölliker, 1845) (additional source)
Caretta caretta (Linnaeus, 1758) (additional source)
Catriona gymnota (Couthouy, 1838) (additional source)
Caudina arenata (Gould, 1841) (additional source)
Cavolinia uncinata (A. d'Orbigny, 1835) (additional source)
Cerapus tubularis Say, 1817 (basis of record)
Ceriantheopsis americana (Agassiz in Verrill, 1864) (basis of record)
Chaetogaster limnaei von Baer, 1827 (basis of record)
Chaetopleura (Chaetopleura) apiculata (Say, 1834) represented as Chaetopleura apiculata (Say, 1834) (basis of record)
Chaetopterus variopedatus (Renier, 1804) (additional source)
Chaetozone setosa Malmgren, 1867 (additional source)
Chelonia mydas (Linnaeus, 1758) (additional source)
Chelonibia patula (Ranzani, 1818) accepted as Chelonibia testudinaria (Linnaeus, 1758) (additional source)
Childia groenlandica (Levinsen, 1879) (additional source)
Chiridotea caeca (Say, 1818) accepted as Chiridotea coeca (Say, 1818) (additional source)
Chiridotea nigrescens Wigley, 1961 accepted as Chiridotea coeca (Say, 1818) (basis of record)
Chiropsalmus quadrumanus (F. Muller, 1859) (additional source)
Chthamalus fragilis Darwin, 1854 (basis of record)
Cirolana concharum (Stimpson, 1853) accepted as Politolana concharum (Stimpson, 1853) (basis of record)
Cirolana polita (Stimpson, 1853) accepted as Politolana polita (Stimpson, 1853) (basis of record)
Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Cirratulus grandis Verrill, 1873 accepted as Cirriformia grandis (Verrill, 1873) (basis of record)
Clitellio (Clitellio) arenarius (Müller, 1776) (additional source)
Clymenella torquata (Leidy, 1855) (additional source)
Clymenella zonalis (Verrill, 1874) (additional source)
Colus ventricosus (Gray, 1839) accepted as Colus terraenovae Bouchet & Warén, 1985 (basis of record)
Conopeum tenuissimum (Canu, 1908) (basis of record)
Corbula swiftiana C. B. Adams, 1852 accepted as Caryocorbula swiftiana (C. B. Adams, 1852) (basis of record)
Coronadena mutabilis (Verrill, 1873) (basis of record)
Costoanachis avara (Say, 1822) (basis of record)
Craniella gravida accepted as Craniella cranium (Müller, 1776) (basis of record)
Crucibulum striatum (Say, 1826) (additional source)
Cryptosula pallasiana (Moll, 1803) (additional source)

English American tube-dwelling anemone for Ceriantheopsis americana (Agassiz in Verrill, 1864)
English ceriantharian anemone for Ceriantheopsis americana (Agassiz in Verrill, 1864)
English northern stony coral [from synonym] for Astrangia astreiformis Milne Edwards & Haime, 1849
English southern cerianthid for Ceriantheopsis americana (Agassiz in Verrill, 1864)
English star coral [from synonym] for Astrangia astreiformis Milne Edwards & Haime, 1849
English yellow flabby-sponge for Mycale (Carmia) fibrexilis (Wilson, 1894)