| Birth Date: | 11 October 1792 |
| Birth Place: | Poole, England |
| Death Place: | Selborne, England |
| Workplaces: | King's College London, Guy's Hospital, London |
| Known For: | British Stalke-eyed Crustacea |
| Awards: | Fellow of the Royal College of Surgeons and of the Linnean Society (president) |
| Relatives: | Philip Henry Gosse (cousin) |
| Author Abbrev Zoo: | Bell |
| Spouse: | Jane Roberts (scientific illustrator) |
| Children: | One daughter, Susan Gosse |
Thomas Hornsey Bell FRS FLS (11 October 1792 – 13 March 1880) was an English zoologist, dental surgeon and writer, born in Poole, Dorset, England.
Bell, like his mother Susan, took a keen interest in natural history which his mother also encouraged in his younger cousin Philip Henry Gosse. Bell left Poole in 1813 for his training as a dental surgeon in London. He is listed in 1817 as having an address at number 17 Fenchurch Street, and as being a committee member of the newly formed London Peace Society. By 1819 his address is given as 18 Bucklersbury, also in the city of London. He combined two careers, becoming Professor of Zoology at King's College London in 1836 (on the strength of amateur research) and lecturing on anatomy at Guy's Hospital. He became a fellow of the Royal College of Surgeons in 1844. He was the first president of the Ray Society, founded the same year,[1] and President of the Linnean Society in 1858.
Bell was at the heart of the scientific establishment and when Charles Darwin returned to London from the Beagle expedition on 2 December 1836, Bell was quick to take on the task of describing the reptile specimens.[2] He was also entrusted with the specimens of Crustacea collected on the voyage. He was the authority in this field; his book British Stalke-eyed Crustacea is a masterwork. He played a significant part in the inception of Darwin's theory of natural selection in March 1837 when he confirmed that the giant Galápagos tortoises were native to the islands, not brought in by buccaneers for food as Darwin had thought.[3] He supported the arrangements for publication of Zoology of the Voyage of H.M.S. Beagle, but then was very slow to make progress on the work, and though the first parts of work were published in 1838, Bell's contribution on reptiles (Part 5) was published in two numbers, in 1842 and 1843,[4] and he subsequently failed to take any action on the Crustacea.
As President of the Linnean Society, Bell chaired the meeting on 1 July 1858 at which Darwin and Alfred Russel Wallace's theories on natural selection were first presented in a joint reading of their papers On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection. Bell appears to have been unimpressed, and in his annual presidential report presented in May 1859 wrote that "The year which has passed has not, indeed, been marked by any of those striking discoveries which at once revolutionize, so to speak, the department of science on which they bear".
In his seventieth year Bell retired to The Wakes, a house at Selborne, where he took a keen interest in its former resident, the amateur naturalist Gilbert White.[5] In 1877 he published a new edition of White's book The Natural History of Selborne. Bell died at Selborne in 1880.
Bell married Jane Sarah, daughter of William Roberts, Esq., at St Mary's Church, Rotherhithe on 3 December 1832.[6] The couple had one child, a daughter, Susan Gosse,[7] born 29 March 1836.[8] Susan pre-deceased her parents on 4 January 1854. Jane died on 29 June 1873.
A few of Bell's works were illustrated by Jane, who signed herself Jane S. Bell.
Bell is commemorated in the scientific names of several species and subspecies of reptiles.[9]