Anaitides minuta Treadwell, 1937 accepted as Phyllodoce minuta (Treadwell, 1937) (original description)
Aphrodita castanea Moore, 1910 accepted as Aphrodita negligens Moore, 1905 (additional source)
Apomatus similis Marion & Bobretzky, 1875 (additional source)
Chloeia entypa Chamberlin, 1919 (additional source)
Cirratulus inhamatus Treadwell, 1937 accepted as Aphelochaeta multifilis (Moore, 1909) (original description)
Diopatra californica Moore, 1904 accepted as Diopatra splendidissima Kinberg, 1865 (additional source)
Glycera rugosa Johnson, 1901 accepted as Glycera americana Leidy, 1855 (additional source)
Halosydna obtusacirrata Treadwell, 1937 accepted as Halosydna latior Chamberlin, 1919 (original description)
Hesione panamena Chamberlin, 1919 accepted as Hesione intertexta Grube, 1878 (additional source)
Hyalinoecia juvenalis Moore, 1911 (additional source)
Lepidasthenia fragilis (Baird, 1863) accepted as Arctonoe fragilis (Baird, 1863) (new combination reference)
Lepidasthenia ornata Treadwell, 1937 accepted as Lepidasthenia virens (Blanchard in Gay, 1849) (original description)
Lepidasthenia pulchra (Johnson, 1897) accepted as Arctonoe pulchra (Johnson, 1897) (new combination reference)
Lepidonotus pilosus Treadwell, 1937 accepted as Chaetacanthus pilosus (Treadwell, 1937) (original description)
Maldane carinata Moore, 1923 accepted as Maldane cristata Treadwell, 1923 (additional source)
Nephthys dibranchis Grube, 1877 accepted as Aglaophamus dibranchis (Grube, 1877) (additional source)
Nereis ambiguus Treadwell, 1937 accepted as Nereis ambigua Treadwell, 1937 (original description)
Panthalis adumbrata Hoagland, 1920 accepted as Polyodontes atromarginatus Horst, 1917 (additional source)
Pectinaria brevicoma Johnson, 1901 accepted as Cistenides brevicoma (Johnson, 1901) (additional source)
Pomatostegus stellatus (Abildgaard, 1789) (additional source)
Streblosoma magna Treadwell, 1937 accepted as Thelepus crispus Johnson, 1901 (original description)