Mesanella nigricans (O.F. von Möllendorff,1900)
Chrysallis nigriceps P. Bartsch
Aegista nikkoensis J.T. Kuroda, 1934
Helicostyla nimbosa W.J. Broderip, 1841
Helicostyla nimbosa antiqua (P. Bartsch, 1919)
Euhadra nipponensis (W. Kobelt, 1876)
Trishoplita nitens H.A. Pilsbry & Y. Hirase,1904
Calocochlia norrisii (G.B. I Sowerby, 1842)
Aegista nunobikiensis H. OgaItô & E. Sorita,1981
Phoenicobius oblongus (G.B. I Sowerby, 1841)
Metodontia obstructa (P.M. Heude, 1882)
Aegista oculus (L. Pfeiffer, 1850)
Laeocathaica odophora O.F. von Möllendorff,1899
Cathaica ohlmeri A. Andreae, 1903
Helicostyla okadai J.T. Kuroda, 1932
Trishoplita okinoshimae H.A. Pilsbry, 1902
Aegista omiensis H.A. Pilsbry, 1902
Aegista omma (H.A. Pilsbry & Y. Hirase,1904)
Nesiohelix omphalina (Y. Hirase, 1915)
Nesiohelix omphalina bipyramidalis J.T. Kuroda & S. Emura,1943
Phoenicobius oomorphus (G.B. I Sowerby, 1841)
Phengus opalina (G.B. I Sowerby, 1841)
Trishoplita optima H.A. Pilsbry, 1902
Helicostyla orbitula G.B. I Sowerby, 1841
Pliocathaica orithyia (FOSSIL) (Von Martens, 1879 †)
Aegista osbeckii (R.A. Philippi, 1847)
Euhadra oshimae (H.A. Pilsbry, 1901)
Nesiohelix oshiroi T. Habe & M. Chinen, 1980
Trishoplita ottoi H.A. Pilsbry, 1901
Canistrum ovoideum (G.B. I Sowerby, 1833)
Canistrum ovoideum euryzonum (L. Pfeiffer, 1847)
Canistrum ovoideum luzonicum (G.B. I Sowerby, 1833)
Euhadra pachya H.A. Pilsbry, 1902
Aegista packhaensis (A.R.J.B. Bavay& P. Dautzenberg, 1908)
Nesiohelix palaeomphalina M. Azuma, 1983