Diploneis contraversa (Mann) F.W. Mills, 1934 (new combination reference)
Frustulia lewisinana var. julieni (Heribaud & Brun in Heribaud) F.W. Mills, 1934 accepted as
Navicula julieni Héribaud & Brun in Héribaud, 1893 (new combination reference)
Navicula cincta var. striata 'Rochoux d'Aubert in Héribaud et al.' according Mills (original description)
Navicula clavata f. minor (Cleve) F.W. Mills, 1934 (new combination reference)
Navicula clavata f. minuta (Cleve) F.W. Mills, 1934 (new combination reference)
Navicula contigua var. zechenteri (Pantocsek) F.W. Mills, 1934 accepted as
Navicula zechenteri Pantocsek, 1886 (new combination reference)
Navicula crabro var. confecta (Schmidt in Schmidt et al.) F.W. Mills, 1934 accepted as
Navicula confecta A.Schmidt, 1875 (new combination reference)
Navicula crabro var. dirhombus (Schmidt in Schmidt et al.) F.W. Mills, 1934 (new combination reference)
Navicula crabro var. expleta (Schmidt in Schmidt et al.) F.W. Mills, 1934 accepted as
Navicula expleta var. expleta Schmidt in Schmidt et al., 1881 (new combination reference)
Navicula crabro var. giebelii (Schmidt) F.W. Mills, 1934 accepted as
Navicula giebelii Schmidt, 1874 (new combination reference)
Navicula crabro var. gloriosa (Brun) F.W. Mills, 1934 accepted as
Navicula gloriosa var. gloriosa Brun, 1891 (new combination reference)
Navicula cuspidata var. longicolis (Suringar) F.W. Mills, 1934 (new combination reference)
Navicula cynthia var. elongata (Cleve) F.W. Mills, 1934 accepted as
Diploneis cynthia var. elongata Cleve, 1894 (new combination reference)
Navicula cynthia var. intermedia (M. Peragallo in Peragallo & Peragallo) F.W. Mills, 1934 accepted as
Diploneis cynthia var. intermedia M. Peragallo in Peragallo & Peragallo, 1911 (new combination reference)
Navicula cynthia var. sibirica (Cleve) F.W. Mills, 1934 accepted as
Diploneis cynthia var. sibirica Cleve, 1894 (new combination reference)
Navicula dactylus var. horrida (M. Peragallo & Heribaud in Heribaud) F.W. Mills, 1934 accepted as
Navicula major var. horrida M.Peragallo & Héribaud-Joseph (new combination reference)
Navicula dactylus var. miocenica (Heribaud & M. Peragallo in Heribaud) F.W. Mills, 1934 (new combination reference)
Navicula decurrens var. brevistriata (Grunow) F.W. Mills, 1934 (new combination reference)
Navicula didelta (Hustedt) F.W. Mills, 1934 accepted as
Neidium didelta Hustedt, 1922 (new combination reference)
Navicula distinctepunctatum (Hustedt) F.W. Mills, 1934 accepted as
Neidium distinctepunctatum Hustedt, 1922 (new combination reference)
Navicula divergens f. ornata (Cleve) F.W. Mills, 1934 (new combination reference)
Navicula elliptica var. hankae (Skvortzow) F.W. Mills, 1934 accepted as
Diploneis elliptica var. hankae Skvortzow, 1929 (new combination reference)
Navicula elliptica var. ladogensis (Cleve) Bolochoncew accepted as
Diploneis elliptica var. ladogensis Cleve, 1891 accepted as
Diploneis ladogensis P.T. Cleve, 1891 (new combination reference)
Navicula elliptica var. magnapunctata (Fontell) F.W. Mills, 1934 accepted as
Diploneis elliptica var. magnapunctata Fontell, 1917 (new combination reference)
Navicula episcopalis var. manschurica (Skvortzow) F.W. Mills, 1934 accepted as
Pinnularia episcopalis var. manschurica Skvortzow, 1928 (new combination reference)
Navicula episcopalis var. robusta (Fontell) F.W.Mills, 1934 accepted as
Pinnularia episcopalis var. robusta C.W.Fontell, 1917 (new combination reference)
Navicula esox var. major (Hustedt in Schmidt et al.) F.W. Mills, 1934 (new combination reference)
Navicula exemta var. crabroniformis (Grunow in Schmidt et al.) F.W. Mills, 1934 accepted as
Navicula crabroniformis Grunow in Schmidt et al., 1875 (new combination reference)
Navicula exemta var. digrediens (Cleve) F.W. Mills, 1934 accepted as
Diploneis exemta var. digrediens Cleve, 1894 (new combination reference)
Navicula exilis var. genuina (Mayer) F.W. Mills, 1934 accepted as
Anomoeoneis exilis var. genuina Mayer, 1919 (new combination reference)
Navicula fasciata var. undulata (Mayer) F.W. Mills, 1934 accepted as
Caloneis fasciata var. undulata Mayer, 1917 (new combination reference)
Navicula finnica (Ehrenberg) F.W.Mills, 1934 accepted as
Cocconeis finnica Ehrenberg, 1838 (new combination reference)
Navicula fluminensis var. loczyi (Pantocsek) F.W. Mills, 1934 accepted as
Navicula loczyi Pantocsek, 1889 (new combination reference)
Navicula fulva var. asymmetrica (Dippel) F.W. Mills, 1934 (new combination reference)
Navicula fusca f. minor (Skvortzow) F.W. Mills, 1934 (new combination reference)
Navicula fusca var. japonica (Cleve) F.W. Mills, 1934 accepted as
Diploneis fusca var. japonica Cleve, 1894 (new combination reference)
Navicula fusca var. nigricans (Pantocsek) F.W. Mills, 1934 accepted as
Navicula nigricans Pantocsek, 1892 (new combination reference)
Navicula fusca var. oamaruensis (Cleve) F.W. Mills, 1934 accepted as
Diploneis fusca var. oamaruensis Cleve, 1894 (new combination reference)
Navicula fusca var. pseudofusca (Pantocsek) F.W. Mills, 1934 accepted as
Navicula pseudofusca Pantocsek, 1886 (new combination reference)
Navicula fusca var. subfusca (Pantocsek) F.W. Mills, 1934 accepted as
Navicula subfusca Pantocsek, 1892 (new combination reference)
Navicula fusca var. vanheurckii (Cleve) F.W. Mills, 1934 accepted as
Diploneis fusca var. vanheurckii Cleve, 1894 (new combination reference)
Navicula gallica var. nitzschioides (Grunow) F.W.Mills, 1934 accepted as
Diadesmis nitzschioides Grunow, 1879 (new combination reference)
Navicula gemmata var. oamaruensis (Cleve) F.W. Mills, 1934 accepted as
Diploneis gemmata var. oamaruensis Cleve, 1894 (new combination reference)
Navicula gemmata var. punctata (Cleve) F.W. Mills, 1934 accepted as
Diploneis gemmata var. punctata Cleve, 1894 (new combination reference)
Navicula gibba var. curtestriata (Pantocsek) F.W. Mills, 1934 accepted as
Navicula peregrina var. curtestriata Pantocsek, 1889 (new combination reference)
Navicula hemiptera var. commutata (Grunow) F.W.Mills, 1934 accepted as
Navicula commutata f. commutata Grunow in Schmidt et al., 1876 (new combination reference)
Navicula incomperta f. fossilis (Pantocsek) F.W. Mills, 1934 accepted as
Navicula incomperta var. fossilis Pantocsek, 1902 (new combination reference)
Navicula inconstans var. constricta (Mayer) F.W. Mills, 1934 accepted as
Pinnularia inconstans var. constricta Mayer, 1916 (1917) (new combination reference)
Navicula inconstans var. curta (Mayer) F.W. Mills, 1934 (new combination reference)
Navicula inconstans var. genuina (Mayer) F.W. Mills, 1934 accepted as
Pinnularia inconstans var. genuina Mayer, 1916 (1917) (new combination reference)
Navicula inconstans var. inconstans (Mayer) F.W. Mills, 1934 accepted as
Pinnularia inconstans f. inconstans Mayer, 1916 (1917) (new combination reference)
Navicula inconstans var. semicontinua (Mayer) F.W. Mills, 1934 accepted as
Pinnularia inconstans var. semicontinua Mayer, 1916 (1917) (new combination reference)
Navicula interrupta var. gorjanovicii (Pantocsek) F.W. Mills, 1934 accepted as
Navicula gorjanovicii var. gorjanovicii Pantocsek, 1886 (new combination reference)
Navicula interrupta var. wiesneri (Pantocsek) F.W. Mills, 1934 accepted as
Navicula wiesnerii Pantocsek, 1886 † (new combination reference)
Navicula jamaicensis var. gigantea (Cleve) F.W. Mills, 1934 accepted as
Dictyoneis jamaicensis var. gigantea Cleve, 1894 (new combination reference)
Navicula juvenis (Ehrenberg) F.W. Mills, 1934 (new combination reference)
Navicula kariana var. tenuior (Cleve) F.W. Mills, 1934 accepted as
Navicula subimpressa var. tenuior Cleve, 1883 (new combination reference)
Navicula kotschyi var. undulata (Hustedt) F.W.Mills, 1934 (new combination reference)
Navicula lacuslemanii var. gibbosa (Brun) F.W. Mills, 1934 accepted as
Diploneis lacuslemanii var. gibbosa Brun, 1895 (new combination reference)
Navicula lata var. lata (W. Smith) F.W. Mills, 1934 (new combination reference)
Navicula legumen (Ehrenberg) F.W.Mills, 1934 accepted as
Stauroptera legumen Ehrenberg, 1843 (new combination reference)
Navicula lewisiana var. julieni (Heribaud & Brun in Heribaud) F.W. Mills, 1934 accepted as
Navicula julieni Héribaud & Brun in Héribaud, 1893 (new combination reference)
Navicula lyra var. indefinita M.Peragallo accepted as
Navicula indefinita M. Peragallo in Tempère & Peragallo, 1908 (new combination reference)
Pinnularia cymatopleura West & G.S.West accepted as
Navicula cymatopleura West & G.S.West, 1911 (new combination reference)
Pinnularia dactylus var. gracilis (Heribaud) F.W. Mills, 1934 (new combination reference)
Pinnularia dactylus var. miocenica (Heribaud & M. Peragallo in Heribaud) F.W. Mills, 1934 (new combination reference)
Pinnularia delicata (Frenguelli) Mills, 1934 accepted as
Pinnularia maidanae Guerrero & Vouilloud, 2022 † (source of synonymy)