Aclis acuta (Jeffreys, 1884) accepted as Parastilbe acuta (Jeffreys, 1884) (additional source)
Aclis tenuis A. E. Verrill, 1882 (basis of record)
Acteocina bidentata (A. d'Orbigny, 1841) accepted as Cylichnella bidentata (A. d'Orbigny, 1841) (basis of record)
Acteocina oryza (Totten, 1835) accepted as Cylichnella oryza (Totten, 1835) (basis of record)
Acteon melampoides Dall, 1881 (basis of record)
Admete nodosa A. E. Verrill & S. Smith, 1885 accepted as Brocchinia nodosa (A. E. Verrill & S. Smith, 1885) (basis of record)
Admete viridula (O. Fabricius, 1780) (additional source)
Alderia modesta (Lovén, 1844) (additional source)
Amauropsis islandica (Gmelin, 1791) (additional source)
Anatoma americana Bandel, 1998 accepted as Anatoma proxima (Dall, 1927) (additional source)
Ancula gibbosa (Risso, 1818) (additional source)
Aplysia morio (A. E. Verrill, 1901) (additional source)
Aporrhais occidentalis (H. Beck, 1836) accepted as Arrhoges occidentalis (H. Beck, 1836) (additional source)
Assiminea succinea (L. Pfeiffer, 1840) accepted as Angustassiminea succinea (L. Pfeiffer, 1840) (additional source)
Astyris lunata (Say, 1826) (additional source)
Astyris multilineata (Dall, 1889) (additional source)
Astyris rosacea (A. Gould, 1840) (additional source)
Benthobia tryonii Dall, 1889 (additional source)
Benthonella tenella (Jeffreys, 1869) (additional source)
Bittiolum alternatum (Say, 1822) (additional source)
Bittiolum varium (L. Pfeiffer, 1840) (additional source)
Boreocingula castanea (Møller, 1842) (additional source)
Buccinum ciliatum (O. Fabricius, 1780) (additional source)
Buccinum finmarkianum Verkrüzen, 1875 (additional source)
Buccinum fragile Verkrüzen, 1878 (basis of record)
Buccinum frustulatum A. N. Golikov, 1980 (basis of record)
Buccinum hydrophanum Hancock, 1846 (additional source)
Buccinum kjennerudae Bouchet & Warén, 1985 (additional source)
Buccinum maltzani Pfeffer, 1886 (additional source)
Buccinum micropoma Thorson, 1944 (additional source)
Buccinum scalariforme Møller, 1842 (additional source)
Buccinum sericatum Hancock, 1846 accepted as Buccinum ciliatum sericatum Hancock, 1846 (basis of record)
Bulbus fragilis (Leach, 1819) (additional source)
Bulbus smithii T. Brown, 1839 (additional source)
Busycon carica (Gmelin, 1791) (additional source)
Busycon laeostomum Kent, 1982 accepted as Sinistrofulgur laeostomum (Kent, 1982) (basis of record)
Busycon sinistrum Hollister, 1958 accepted as Sinistrofulgur sinistrum (Hollister, 1958) (basis of record)
Cadlina laevis (Linnaeus, 1767) (additional source)
Caecum cooperi S. Smith, 1860 (basis of record)
Caecum johnsoni Winkley, 1908 (additional source)
Calliostoma bairdii A. E. Verrill & S. Smith, 1880 (additional source)
Calliostoma occidentale (Mighels & C. B. Adams, 1842) (additional source)
Calliotropis regalis (A. E. Verrill & S. Smith, 1880) (basis of record)
Cavolinia uncinata (A. d'Orbigny, 1835) (additional source)
Cerithiopsis emersonii (C. B. Adams, 1839) accepted as Retilaskeya emersonii (C. B. Adams, 1839) (additional source)
Cerithiopsis greenii (C. B. Adams, 1839) (additional source)
Cerithiopsis virginica J. B. Henderson & Bartsch, 1914 (basis of record)
Chrysallida cancellata (A. d'Orbigny, 1841) (basis of record)
Cingula robusta H. C. Lea, 1845 accepted as Rissoa robusta (H. C. Lea, 1845) (basis of record)
Circulus liratus (A. E. Verrill, 1882) (basis of record)
Clio pyramidata Linnaeus, 1767 (additional source)
Cocculina leptalea A. E. Verrill, 1884 accepted as Copulabyssia leptalea (A. E. Verrill, 1884) (basis of record)
Colus islandicus (Mohr, 1786) (additional source)
Colus latericeus (Møller, 1842) accepted as Retifusus latericeus (Møller, 1842) (additional source)
Colus pubescens (A. E. Verrill, 1882) (additional source)
Colus pygmaeus (A. Gould, 1841) (additional source)
Colus sabini (J. E. Gray, 1824) (additional source)
Corambe obscura (A. E. Verrill, 1870) (additional source)
Costoanachis avara (Say, 1822) (additional source)
Costoanachis lafresnayi (P. Fischer & Bernardi, 1857) accepted as Cotonopsis lafresnayi (P. Fischer & Bernardi, 1857) (basis of record)
Couthouyella striatula (Couthouy, 1838) (additional source)
Cratena pilata (A. Gould, 1870) (additional source)
Crepidula convexa Say, 1822 (additional source)
Crepidula plana Say, 1822 (additional source)
Crucibulum striatum (Say, 1826) (additional source)
Curtitoma hebes (A. E. Verrill, 1880) (additional source)
Curtitoma incisula (A. E. Verrill, 1882) (additional source)
Curtitoma ovalis (Friele, 1877) (basis of record)
Curtitoma reticulata (T. Brown, 1827) accepted as Curtitoma trevelliana (W. Turton, 1834) (basis of record)
Curtitoma violacea (Mighels & C. B. Adams, 1842) (additional source)
Cuthona gymnota (Couthouy, 1838) accepted as Catriona gymnota (Couthouy, 1838) accepted as Tenellia gymnota (Couthouy, 1838) (additional source)
Cuthona veronicae (A. E. Verrill, 1880) (basis of record)
Cyclostremiscus pentagonus (Gabb, 1873) (basis of record)
Cylichna alba (T. Brown, 1827) (additional source)
Cylichna eburnea A. E. Verrill, 1885 (additional source)
Cylichna gouldii (Couthouy, 1839) (basis of record)
Cylichna linearis Jeffreys, 1867 accepted as Cylichna cylindracea (Pennant, 1777) (basis of record)
Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842) (additional source)
Cylichna vortex (Dall, 1881) (basis of record)
Cymatium cingulatum (Lamarck, 1822) accepted as Linatella caudata (Gmelin, 1791) (basis of record)
Dendronotus elegans A. E. Verrill, 1880 (basis of record)
Dentimargo eburneola (Conrad, 1834) (basis of record)
Dentimargo smithii (A. E. Verrill, 1885) (basis of record)
Diacavolinia elegans van der Spoel, Bleeker & Kobayasi, 1993 accepted as Diacavolinia strangulata (Deshayes, 1823) (basis of record)
Diacria atlantica Dupont, 1998 accepted as Diacria trispinosa (Blainville, 1821) (additional source)
Dinophysis acuminata Claparède & Lachmann, 1859 (additional source)
Diodora cayenensis (Lamarck, 1822) (basis of record)
Diodora tanneri (A. E. Verrill, 1882) (basis of record)
Doto formosa A. E. Verrill, 1875 (additional source)
Drilliola pruina (R. B. Watson, 1881) accepted as Retidrillia pruina (R. B. Watson, 1881) (basis of record)
Elachisina globuloides (Warén, 1972) (additional source)
Emarginula nordica Pérez Farfante, 1947 (basis of record)
Epitonium angulatum (Say, 1831) (additional source)
Epitonium celesti (Aradas, 1854) (additional source)
Epitonium greenlandicum (Perry, 1811) accepted as Boreoscala greenlandica (Perry, 1811) (additional source)
Epitonium humphreysii (Kiener, 1838) (additional source)
Epitonium multistriatum (Say, 1826) (additional source)
Epitonium novangliae (Couthouy, 1838) (basis of record)
Epitonium rupicola (Kurtz, 1860) accepted as Gyroscala rupicola (Kurtz, 1860) (additional source)
Ercolania fuscata (A. Gould, 1870) (additional source)