Succincta oaxacana H.A. Pilsbry, 1920 Oaxaca, Mexico
Helicina occidentalis L. Guilding, 1828 Grenadines, Saint Vincent
Hendersonia occulta (T. Say, 1831) Florida
Ogasawarana ogasawarana (H.A. Pilsbry, 1902) Japan, Ogasawara Islands
Ogasawarana optima (A.J. Wagner, 1905) Japan, Ogasawara Islands
Olygyra orbiculata (T. Say, 1818) Florida6 mm
Olygyra orbiculata tropica L. Pfeiffer, 1852 USA, Texas9 mm
Helicina oskari A.J. Wagner, 1911 Brazil, Espirito Santo10 mm
Aphanoconia osumiense (H.A. Pilsbry, 1901) Japan, Kagoshima
Helicina ouenensis T.D.A. Cockerell, 1930
Succincta oweniana (L. Pfeiffer, 1849) Chiapas, Mexico
Oxyrhombus oxyrhyncha (J.C.H. Crosse& E.O. Debeaux, 1863) Panama
Helicina oxytropis G.B. Sowerby, 1838 Brazil7 mm
Geophorus oxytropis (J.E. Gray, 1839) Malaysia, Borneo14 mm
Aphanoconia pachystoma (E.A. Smith, 1896)
Orobophana pacifica (W.H. Pease, 1865) Tuamotu5 mm
Helicina pallida A.A. Gould, 1847 Fiji Islands
Schasicheila palmeri W.H. Dall, 1905 Mexico, San Luis Potosì
Schasicheila pannucea (P.M.A. Morelet, 1849) Guatemala
Helicina papyracea (W.J. Broderip, 1841) Philippines, Bohol Island
Alcadia paraensis (L. Pfeiffer, 1859) Brazil, Sao Paulo
Sulfurina parva (G.B. Sowerby, 1842)
Sturanya parvula (W.H. Pease, 1868)
Helicina pazi J.C.H. Crosse, 1865 French Polinesia, Gambier Archipelago
Lucidella peasei H.A. Pilsbry, 1933
Pleuropoma pelewensis (E.R. Sykes, 1901) Palau
Lucidella persculpta H.A. Pilsbry& A.P. Brown, 1912 Jamaica
Helicina peruviana P.M.A. Morelet, 1863
Troschelviana petitiana (A.V.M.D. D'Orbigny,1842) Cuba
Troschelviana pfeifferiana (R. Arango in L. Pfeiffer, 1866) Cuba
Helicina phakos A.J. Wagner, 1911
Lewisia philippiana (C.B. Adams, 1851) Jamaica
Ceochasma phrixina F.G. Thompson, 1968 Mexico, Colima
Palaeohelicina phronema A.J. Wagner, 1905
Fadyenia pickeringiana E. Chitty, 1857 Jamaica