The second original authority to describe the present species was our countryman Pennant in his ‘History of Quadrupeds,’ where he gives the “Leucoryx” as the fifth species of his genus “Antelope.” Pennant based his Leucoryx mainly upon “two drawings of animals in the British Museum, taken from life in 1712 by order of Sir John Lock, Agent of the East India Company at Ispahan; they were preserved as rarities by the Shah of Persia in a park eight leagues from the capital.” Pennant informs us that he had copied his description of these animals from a paper accompanying the drawings. This species, he tells us, inhabits “Gaw Behrein, an island in the Gulf of Bassorah,” meaning, no doubt, what we now call Bahrein Island in the Persian Gulf. Judging from the description and locality it would appear that Pennant’s “Leucoryx” of 1781 was intended for the present Antelope, but the figure in the edition of Pennant’s work of 1793, it must be allowed, gives one rather the idea of a Beisa (_Oryx beisa_). As regards the other authors which we have quoted above as following Pallas in calling this animal _Antilope leucoryx_, it is not necessary to take much trouble about them. They merely repeat the stories of their predecessors without adding anything original thereto, and seem to have had no true ideas of the distinctness of the present species from its allies. It was not, in fact, until 1857 that the present Antelope became properly known to science in Europe by the receipt of living specimens. The first of these was brought from Bombay to England in that year and presented to the Zoological Society of London by Capt. John Shepherd. This animal, which was at first supposed to be a half-grown specimen of the Gemsbok of the Cape, quickly attracted the notice of the late Dr. J. E. Gray, of the British Museum, who had a capital eye for strange mammals of all sorts. Dr. Gray immediately recognized it as belonging to a species unknown to him, and, having apparently no suspicion that it was possibly the veritable “Leucoryx” of the older authors, described it as new at a Scientific Meeting of the Zoological Society held on June 23rd of that year, at which Sclater (then recently elected a member of the Council) well recollects having been himself present, and proposed to call it _Oryx beatrix_, after H.R.H. The Princess Beatrice. Dr. Gray’s description, published in the ‘Proceedings,’ is accompanied by an excellent coloured figure of the Beatrix Antelope drawn by Wolf. Dr. Gray conjectured that the specimen had been brought to Bombay from the shores of the Red Sea, but it is more probable that it was carried there from the Persian Gulf. The typical specimen, which died shortly afterwards, was deposited in the British Museum.