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Show 1871.] SPEKE'S A N T E L O P E A N D A L L I E D T R A G E L A P H I . 483 description of their hiding in the water, and inability to run on hard ground are entirely from native accounts." Mr. Oswell has also most kindly, and I fear at considerable inconvenience, forwarded me for comparison the specimen brought by him from Lake N'gami. The Nakong is mentioned by Mr. Baines in his ' Explorations in S.W. Africa' (p. 458), also by Mr. Andersson in his ' Lake N'gami' (p. 449). The latter brought home a damaged skin, and a sketch of the head, which he submitted to Dr. Gray for identification; but that gentleman naturally, owing to the meagre materials at that time at his command, expressed himself " unable to determine its exact nature, but seemed inclined to consider it identical with Tragelaphus eury'cer-os" (see 'Lake N'gami,' p. 449). Being very desirous to arrive at some definite conclusion concerning this Antelope and the two species of Tragelaphus, viz. T. euryceros and T. angasii, with which, I have reason to believe, it has been occasionally confounded, I have lately made a very careful examination and comparison of all the heads and skins belonging to these three species that I could get access to, both in the British Museum and elsewhere ; and I must express m y obligation to Dr. Gray for the courtesy with which he has afforded m e every facility for examining the specimens under his care, and to Mr. Gerrard for the very great patience with which he has assisted me in that examination. I will now describe the characters by which I believe the skulls and horns, the materials most commonly presented to our judgment in the case of the rarer Antelopes, may be, in case of the three species under consideration, at all times distinguished from each other. For the full description of T. spekii, see P. Z. S. 1864, p. 103 ; for that of T. angasii, P. Z. S. 1848, p. 89 ; and for that of T. euryceros, Proc. Soc. Nat. Hist. Bost. 1852, p. 299. In the accompanying drawings, figs. 1 and 2 (pp. 486, 487) represent heads in m y own collection, which specimens I have the pleasure of submitting for examination this evening. Fig. 3 (p. 488) is taken from the type specimen of T. euryceros in the British Museum, the skulls having unfortunately been destroyed in the case of my own specimens of this Antelope. It will be seen that there is a most remarkable difference in size between these three Antelopes, T. euryceros being, roughly speaking, as much larger than T. angasii as that species is larger than T. spekii-the difference between T. euryceros and T. spekii being about equal to that existing between a Wapiti and a Fallow Deer. The difference of mere size is so great that, had it been duly observed, it would have been, I think, impossible for confusion to have taken place between Antelopes differing so widely in this and many other features. For the purpose I have in view, it is unnecessary to go into osteological details; but there are also, as may be observed, considerable differences in the form of the skulls-the most remarkable of which is, perhaps, the breadth of T. euryceros across the cheeks, a measurement taken from the most laterally projecting parts of the |