Corrected date of the first description of aurochs Bos primigenius (Bojanus, 1827) and steppe bison Bison priscus (Bojanus, 1827)

A newly discovered copy of Ludwig Heinrich Bojanus’ De uro nostrato ejusque sceleto commentatio, Bovis primigenii sceleto aucta in the collection of the Palaeontology Library of the Museum National d’Histoire Naturelle in Paris, France, published in 1825, is presented as an argument that the date of description of aurochs Bos primigenius (Bojanus, 1827) and steppe bison Bison priscus (Bojanus, 1827) should be corrected. Bojanus’ name should be followed by the date 1825, not 1827, when citing those species: Bos primigenius (Bojanus, 1825) and Bison priscus (Bojanus, 1825).