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Sir Clements Robert Markham was an English geographer, explorer and writer. He was secretary of the Royal Geographical Society between 1863 and 1888, and later served as the Society's president for a further 12 years. In the latter capacity he was mainly responsible for organising the British National Antarctic Expedition of 1901-1904, and for launching the polar career of Robert Falcon Scott

Also known as Carl or Karl Eduard von Martens, he was a German zoologist. He attended university in Tübingen, where he graduated in 1855. He then moved to Berlin, where he would be based for the remainder of his career, both at the Zoological Museum of the Berlin University (from 1855) and, from 1859, at the Museum für Naturkunde. In 1860, he embarked on the Thetis expedition of the Prussian expedition to Eastern Asia. When the expedition returned to Europe in 1862, von Martens continued to travel around Maritime Southeast Asia for 15 months. He published the results of the Thetis expedition in two volumes, constituting the Zoologischer Theil of the "Preussische Expedition nach Ost-Asien." Vol. ii, consisting of 447 pages and 22 plates, contained a very full account of the land molluscs. Back in Berlin, von Martens was curator of the malacological and other invertebrate sections until his death. Von Martens described 155 new genera (150 of them molluscs) and almost 1,800 species (including around 1,680 molluscs, 39 crustaceans and 50 echinoderms.

He was a foreign member of the Linnean Society, and a corresponding member of the Zoological Society of London

Wilhelm Engelhard Nathusius (from 1861 Wilhelm von Nathusius-Königsborn) was a wealthy Prussian land owning agriculturalist, industrialist, animal breeder and agronomist who also contributed to studies in zoology, particularly on the eggs of birds. An English translation of his work on eggshells was published by Cyril Tyler in 1964