Sentence:  As an appendix to our history of the bison, it will not be out of place, if we here proceed to give a short sketch of the history of its Old World relative, the little known and almost extinct aurochs or <WSD>zubr</WSD>, our information respecting which is derived from a valuable paper by Dr. Weissenborn of Weimar, published in the 'Magazine of Natural History for May and June 1838.' 
Meaning of the word marked with <WSD> tags:  One of several species of European bison or aurochs, which were unclearly delineated in the 1800s when this sense was in use. (from the 1820s onwards)