the Zoological Society from 1836 and by 1838 was not only one of its Fellows but also a Fellow of the Linnean, Geological and Royal Astronomical Societies. He was on terms of friendship with Charles Darwin, the Secretary of the Geographical Society, and in 1839 both men were elected to the Council of the Zoological Society, Ogilby becoming that Society's Secretary shortly afterwards. In this latter capacity he conducted the Society's correspondence, controlled and catalogued its museum, recorded the animals in its zoological gardens and made recommendations for their purchase. After his appointment as Secretary his contribution of scholarly papers and commentaries to Zoological Society meetings declined. He last named a species (Cercopithecus tantalus – the Tantalus monkey) in April 1841, and his final classification submission was made in January 1843. He continued as Secretary of the Society until resigning in 1847. He had been unremunerated in the post and was succeeded by a salaried official. Recognition His "careful researches which have thrown considerable light on the affinities of the Ruminant species" were acknowledged in 1838 when George Waterhouse named a new species of antelope after him (Cephalophus ogilbii, or Ogilby's duiker). In the previous year W. H. Sykes had dedicated to him ("whose contributions to natural history are so well known") the discovery of a new member of the carp family in the Bihama River (Rohtee ogilbii). In 1846 Sir Thomas Mitchell, after whom Ogilby had named Dipus mitchellii (Mitchell's hopping mouse) in 1838, reciprocated by the naming of Mount Ogilby in the Maranoa River region of Queensland, numbering Ogilby among "the individuals of our own race most distinguished or zealous in the advancement of science and the pursuit of human knowledge... sufficiently well-known in the world to preclude all necessity for further explanation why their names were applied to a part of the world's geography". The order called Chiropoda In the summer of 1829, while studying the actions and organic structure of red howler monkeys, Ogilby noticed what had previously escaped general recognition: the creatures did not use their forelimb extremities to hold objects "between finger and thumb" because their "thumbs" were positioned not opposite but in the same line as the remainder of their digits. Over the next six years he gave particular attention to the other genera of South American monkeys and observed this characteristic as common to all of them. Whereas they had previously been