ɚɹˈɪdʒɪnəli pˈʌblɪʃt ɪn sˈɛts ʌv tˈɛn bᵻtwˌiːn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd nˈaɪnti nˈaɪn ænd nˈaɪntiːnhˈʌndɹɪd fˈoːɹ ænd kəlˈɛktɪvli ɪn tˈuː vˈɑːljuːmz ɪn nˈaɪntiːnhˈʌndɹɪd fˈoːɹ, ɪt kənsˈɪsts ʌv wˈʌnhˈʌndɹɪd pɹˈɪnts ʌv vˈɛɹiəs ˈɔːɹɡənˌɪzəmz, mˈɛnɪəv wˌɪtʃ wɜː fˈɜːst dᵻskɹˈaɪbd baɪ hˈiːkəl hɪmsˈɛlf.
Originally published in sets of ten between 1899 and 1904 and collectively in two volumes in 1904, it consists of 100 prints of various organisms, many of which were first described by Haeckel himself.