His description of the hectocotyl arm of cephalopods, used in sexual reproduction, was widely disbelieved until the 19th century.
hɪz dᵻskɹˈɪpʃən ʌvðə hˈɛktəkˌɑːɾaɪl ˈɑːɹm ʌv sˈɛfɐləpˌɑːdz, jˈuːzd ɪn sˈɛkʃuːəl ɹᵻpɹədˈʌkʃən, wʌz wˈaɪdli dˌɪsbᵻlˈiːvd ʌntˈɪl ðə nˈaɪntiːnθ sˈɛntʃɚɹi.