In the Musée Alaoui, at the Bardo Palace, Tunis, Sclater was also shown an unmistakable figure of a Leucoryx attacked by a Lion, represented on a piece of Roman mosaic pavement. Of this figure Sir Harry Johnston has kindly furnished us with the accompanying sketch (fig. 92, p. 48). The mosaic pavement in question, which was discovered among the remains of a Roman villa in the vicinity of Tunis, contains representations of various animals of the chase found in that district in Roman times. The _Gætulus Oryx_ of Juvenal (Sat. xi. 140) was therefore in all probability the Leucoryx. We are not aware of any authentic records of the occurrence of the Leucoryx on the southern frontiers of Algeria and Morocco, where, in recent times, it has probably been driven far into the interior. But when we go on as far west as Senegal and Nigeria it would appear that the Leucoryx, or a form so closely allied to it as to be barely distinguishable, is still abundant in the Senegambian deserts, and is also, according to Capt. Mockler-Ferryman, met with on the Nile in the vicinity of Lokoja. [Illustration: Fig. 92. A Leucoryx attacked by a Lion. ] The first specimen of the Leucoryx received from Senegal was, so far as we know, that figured by Geoffroy St.-Hilaire and F. Cuvier in 1819 in the ‘Histoire Naturelle des Mammifères’ (plate 376), which was then living in the Jardin des Plantes. This, we are told, was an adult male, standing about four feet high to the top of its head, and having long and well-developed horns. When the thirteenth Earl of Derby formed his great menagerie at Knowsley between 1835 and 1850, the group of the Leucoryx Antelopes was one of the specialities of the collection. The adult male and female were figured by Waterhouse Hawkins in plate xvii. of the ‘Gleanings,’ and the young one, born at Knowsley, forms one of the figures in plate xvi. of the same work. [Illustration: Fig. 93. Young Leucoryx. (From ‘Zoological Sketches.’) ]