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William Lutley Sclater was a zoologist and the son of previous ZSL Secretary, Philip Lutley Sclater. He himself was only ZSL Secretary for 1 year in 1903, before Peter Chalmers Mitchell was selected for the post.

William Ogilby was a zoologist. He is perhaps best known for this work around the classification order of cheiropoda, linking mammals who had hands. He was ZSL Secretary from 1839-1847.

William Yarrell was a zoologist. He was one of the original members of the Zoological Society of London and was a founder of the Royal Entomological Society. He was ZSL Secretary from 1836-1838.