Cantharidus mortenseni (N.H. Odhner, 1924)
Gibbula moussoni (FOSSIL) (C. Mayer, 1861 †)
Trochus multicarinatus P. Fischer, 1876
Jujubinus multicingulatus (FOSSIL) (C.L.F. von Sandberger,1860 †)
Gibbula multicolor (C.F.F. von Krauss, 1848)
Gibbula multicolor hera W.H. Turton, 1932
Clanculus multipunctatus P. Jansen, 1995
Calthalotia mundula (A. Adams & G.F. Angas,1864)
Isanda murrea (L.A. Reeve, 1848)
Conotalopia musiva (A.A. Gould, 1861)
Conotalopia mustelina (A.A. Gould, 1861)
Phorcus mutabilis (R.A. Philippi, 1846)
Clelandella myriamae S. Gofas, 2005
Callumbonella namibiensis E. Rolán, Gonzalez-Porto& Matos-Pita, 2009
Diloma nana A.A. Gould, 1861
Intistoma nashae (FOSSIL) (Clark, 1915 †)
Clanculus natalensis D.G. Herbert, 1993
Monodonta nebulosa (P. Forsskål in C. Niebuhr,1775)
Stomatella nebulosa (A. Adams, 1850)
Pseudominolia nedyma (J.C. Melvill, 1897)
Trochus neglectus (FOSSIL) Martin, 1905 †
Ethminolia nektonica (T.A. Okutani, 1961)
Trochus nemoralis (FOSSIL) Hudleston †
Trochus neptuni (A. Adams, 1855)
Gibbula neraudeaui (FOSSIL) B.M. Landau, L. Ceulemans& F. Van Dingenen, 2016 †
Monodonta neritoides (R.A. Philippi, 1849)
Clanculus nexus L. Bozzetti, 2014
Diloma nigerrima (J.F. Gmelin, 1791)
Diloma nigerrima digna H.J. Finlay, 1926
Stomatella nigra J.R.C. Quoy & J.P. Gaimard,1834
Infundibulum nigropunctatus L.A. Reeve, 1861
Infundibulum nigropunctatus hanleyanus (C.F.F. von Krauss, 1848)
Trochus niloticiformis (FOSSIL) (Schlotheim, 1820 †)
Solarioconulus ninacacanus (FOSSIL) F. Haas, 1953 †
Ethalia nitida A. Adams, 1863