Synonymy of the British non-Marine Mollusca (Recent and Post-Tertiary) - Woodward, Bernard Barham, 1853 -1930 (1926)

Synonymy of the species of Strepomatidae (melanians) of the United States; with critical observations on their affinities, and descriptions of land, fresh water and marine Mollusca - Tryon, George W., (George Washington), 1838 -1888 (Baillière brothers, 1865)

Synopsis filicum; or, A synopsis of all known ferns, including the Osmundaceae, Schizaeaceae, Marattiaceae, and Ophioglossaceae (chiefly derived from the Kew herbarium) Accompanied by figures representing the essential characters of each genus - Baker, John Gilbert, 1834 -1920 (R. Hardwicke, 1874)

Synopsis filicum; or, A synopsis of all known ferns, including the Osmundaceæ, Schizæsveæ, Marattiaceæ, and Ophioglossaceæ (chiefly derived from the Kew herbarium) - Baker, John Gilbert, 1834 -1920 (R. Hardwicke, 1868)

Synopsis methodica molluscorum generum omnium et specierum earum, quae in Museo Menkeano adservantur : cum synonymia critica et novarum specierum diagnosibus - Menke, Karl Theodor, 1791 -1861 (sumtibus Georgi Uslar, 1830)

Synopsis methodica molluscorum generum omnium et specierum earum, quae in Museo Menkeano adservantur : cum synonymia critica et novarum specierum diagnosibus - Menke, Karl Theodor, 1791 -1861 (Sumtibus auctoris, typis Henrici Gelpke, 1828)

Synopsis methodica molluscorum generum omnium et specierum earum, quae in Museo Menkeano adservantur : cum synonymia critica et novarum specierum diagnosibus - Menke, Karl Theodor, 1791 -1861 (G. Uslar, 1830)

Synopsis methodica molluscorum generum omnium et specierum earum, quae in Museo Mankeano adservantur : cum synonymia critica et novarum specierum diagnosibus / auctore Carolo Theodoro Menke - Menke, Karl Theodor, 1791 -1861 (Sumtibus auctoris, typis Henrici Gelpke, 1828)

Synopsis molluscorum extramarinorum Scandinaviæ (Sueciæ, Norvegiæ, Daniæ & Fenniæ) - Westerlund, Carl Agardh, 1831 -1908 ([s.n.], 1897)

Synopsis molluscorum in regione palaearctica viventium ex typo Clausilia Drap - Westerlund, Carl Agardh, 1831 -1908 (Imperatorskaia Akademiia nauk, 1901)

Synopsis novorum, generum, specierum et varietatum, testaceorum viventium anno 1834 promulgatorum, adjectis iis quae in diariis societatis zoologicae Londinensis ab anno 1830 editis relata sunt. Supplementi loco ad. ill. Wiegmann historiae naturalis promtuarium - Müller, Th. (F. Nicolai, 1836)

Synopsis of an arrangement of invertebrate animals in the Free Public Museum of Liverpool - Higgins, H. H. (1874)

Synopsis of an arrangement of invertebrate animals in the Free Public Museum of Liverpool - Higgins, H. H. (Printed by D. Marples & Co, 1880)

A synopsis of the classification of the fresh-water Mollusca of North America, north of Mexico, and a catalogue of the more recently described species - Walker, Bryant, 1856 -1936 (The University, 1918)

Synopsis of the contents of the British Museum - British Museum (Woodfall, 1842)

Synopsis of the contents of the British Museum - British Museum (printed by G. Woodfall, 1837)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, Angel Court, Skinner Street, 1836)

Synopsis of the contents of the British Museum - British Museum (printed by Woodfall, 1837)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, 1835)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, Angel Court, Skinner Street, 1840)

Synopsis of the contents of the British Museum - British Museum (printed by G. Woodfall, 1838)

Synopsis of the contents of the British Museum - British Museum (printed by G. Woodfall, 1839)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall, 1838)

Synopsis of the contents of the British Museum - British Museum (Printed by G. Woodfall and Son, Angel Court, Skinner Street, 1840)

Synopsis of the contents of the British Museum - British Museum (Woodfall, 1841)

Synopsis of the flora of the Laramie group - Ward, Lester F. (Lester Frank), 1841 -1913 (Govt. print. off, 1885)

Synopsis plantarum; seu, Enumeratio systematica plantarum plerumque adhuc cognitarum cum differentiis specificis et synonymis selectis ad modum Persoonii elaborata - Dietrich, David Nathanael Friedrich, 1800 -1888 (B. F. Voigtii, 1839)

Synopsis plantarum :seu, Enumeratio systematica plantarum plerumque adhuc cognitarum cum differentiis specificis et synonymis selectis ad modum Persoonii elaborata - Dietrich, David Nathanael Friedrich, 1800 -1888 (B. F. Voigtii, 1840)

Synoptical flora of North America - Gray, Asa, 1810 -1888 (American Book Company, 1895)

System der urweltlichen Konchylien : durch Diagnose, Analyse und Abbildung der Geschlechter erläutert - Bronn, H. G. (Heinrich Georg), 1800 -1862 (J.C.B. Mohr, 1824)

A system of geology with a theory of the earth : and an explanation of its connexion with the sacred records - Macculloch, John, 1773 -1835 (Longman, Rees, Orme, Brown, and Green, 1831)

Systema helminthum / auctore Carolo Mauritio Diesing ... Sumptibus Academiae caesareae scientiarum - Diesing, Karl Moritz, 1800 -1867 (W. Braumüller, 1851)

Systema mycologicum : sistens fungorum ordines, genera et species, huc usque cognitas, quas ad normam methodi naturalis determinavit - Fries, Elias, 1794 -1878 (Ex Officina Berlingiana, 1821)

Systematic arrangement of the figures - Gray, John Edward, 1800 -1875 (Longman, Brown, Green and Longmans?, 1850?, 1850)

Systematics and zoogeography of the land and fresh-water mollusca of the New Hebrides - Solem, Alan, 1931 - (Chicago Natural History Museum, 1959)

Systematische Eintheilung der Land- und Fluss-Weichthiere nach ihren wesentlichen Kennzeichen, vorzuglich von der Schale : (Aus Histoire naturelle des Mollusques terrestres et fluiratiles de la France. Par Jacq. Philipp Raym. Deraparnaud.) - Sturm, Jakob, 1771 -1848 ([Gedruckt auf Kosten des Herausgebers], 1815)

Systematisches Conchylien-Cabinet - Kobelt, Wilhelm, 1840 -1916 (Bauer und Raspe, 1837)

Systematisches Conchylien-Cabinet - Kobelt, Wilhelm, 1840 -1916 (Bauer und Raspe, 1862)