malacologist Hans Peter Christian Møller (1810–1845) Denmark/Greenland, author of Index Molluscorum Grönlandiae Tommaso di Maria Allery Monterosato (1841–1927) Italy John Edmund Sharrock Moore (1870–1947) Great Britain Otto Andreas Lowson Mörch (1828–1878) Sweden, Denmark, France Pierre Marie Arthur Morelet (1809–1892) France Edward Sylvester Morse (1838–1925) United States Johann Rudolf Albert Mousson (1805–1890) France, Switzerland Robert C. Murdoch (1861–1923) New Zealand N Adolf Naef (1883–1949) Switzerland Walter Narchi (1929–2004) Brazil Kir Nazimovich Nesis (1934–2003) Russia Geoffrey Nevill (1843–1885) Great Britain Wesley Newcomb (1818–1892) United States Hugo Frederik Nierstrasz (1872–1937) Netherlands Mark Norman Australia Jean-Baptiste Noulet (1802–1890) France Carlos Núñez Cortés (1942–) Argentina O Charles Henry O'Donoghue (1885–1961) England Steve O'Shea (1965–) New Zealand Nils Hjalmar Odhner (1884–1973) Sweden William Erwood Old, Jr. (1928–1982) United States Ida Shepard Oldroyd (1856–1940) United States Tom Shaw Oldroyd (1853–1932) United States Walter Reginald Brook Oliver (1883–1957) Australia, New Zealand Alcide Charles Victor Marie Dessalines d'Orbigny (1802–1857) France Charles Russell Orcutt (1864–1929) United States Arnold Edward Ortmann (1863–1927) United States P J.J.I. Alcide de Paladilhe (1814–1876) France Paul Maurice Pallary (1869–1942) France/Algeria Katherine Evangeline Hilton Van Winkle Palmer (1895–1982) United States, Tertiary molluscs Christine Parent Canada, land snails Marianna Paulucci (1835–1919) Italy William Harper Pease (1824–1871) United States Jean Paul Louis Pelseneer (1863–1945) Belgium Rémy Perrier (1861–1936) France George Perry (1771-18??) Great Britain, naturalist and malacologist Vladimir Pešić Montenegro Sauveur Abel Aubert Petit de la Saussaye (1792–1870) France Georg Johann Pfeffer (1854–1931) Germany, zoologist Carl Jonas Pfeiffer (1779–1836) Germany Ludwig Karl Georg Pfeiffer (1805–1877) Germany, physician, botanist and conchologist Rodolfo Amando Philippi (1808–1904) Germany Jean Piaget (1896-1980) Switzerland Henry Augustus Pilsbry (1862–1957) United States István Pintér (1911–1998) Hungary László Ernö Pintér (1942–2002) Hungary Giuseppe Saverio Poli (1746–1825) Italy Carlo Pollonera (1849–1923) Italy Winston Ponder (1941–) New Zealand John Ponsonby-Fane (1848–1916) Great Britain Guido Poppe (1954–) Belgian Arthur William Baden Powell (1901–1987) New Zealand Temple Prime (1832–1903) United States Alice Pruvot-Fol (1873–1972) France Flávio Dias Passos (1971–) Brazil Q Jean René Constant Quoy (1790–1869) France R Lewis Radcliffe (1880–1950) United States Constantine Samuel Rafinesque (1783–1840) Ottoman Empire Sander Rang (1793-1844) France César Auguste Récluz (1799–1873) France Lovell Augustus Reeve (1814–1865) United Kingdom Harald Alfred Rehder (1907–1996) United States Lois Corea Rehder (1911–1988) United States, spouse of Harald Alfred Rehder Amanda Reid Australia Otto Wilhelm Hermann Reinhardt (1838-1924) Germany Hendrik van Rijgersma (1835–1877) Netherlands Jean Risbec (1895–1964) France Antoine Risso (1777–1845) France, naturalist Guy Coburn Robson (1888–1945) United Kingdom