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Show 102 MR. W. BATESON ON [Feb. 2, sexes of this Gazelle, received from Herr Menges, which show well the extraordinary long neck of this animal, as represented in the accompanying drawing (see p. 101). No other Antelope has a similar structure, which at once reminds one of a Giraffe. 9. ORYX BEISA (Riipp.) ; Thomas, I. c. A skull and two flat skins of a female O. beisa, which is locally known as " Baet." 10. STREPSICEROS KUDU, Gray. A flat skin of this Antelope, locally called " Arrah Goder." 11. S T R E P S I C E R O S IMBERBIS, Blyth. A flat skin of this Antelope, which is said to be known as " Goriali Goder." This makes 11 species of Antelopes of which Capt. Swayne has forwarded specimens from Berbera. 1 much regret that he has not sent m e accompanying notes on their habits and exact localities, but he promises to do so. At least two other Antelopes are found in Somaliland, namely, a Water-buck (Cobus sp. inc.), as mentioned by Mr. Lort Phillips (P. Z. S. 1885, p. 932); and a "small red Antelope of the. Klip-springer kind ; horns about 2 inches long; female hornless; same size as Alikhud : called ' Beira ' by the natives " : as described by Capt. Swayne in his letters. Capt. Swayne's brother, Lieut. E. J. Swayne, Bengal Staff Corps, met with this species in the Gadaburri country, but was not able to shoot a specimen. It may possibly be a Cephulophus. 6. On Numerical Variation in Teeth, with a Discussion of the Conception of Homology. By W . BATESON, M.A., Fellow of St. John's College, Cambridge. [Received February 2, 1892.] The following paper is an abstract of facts regarding the Numerical Variation of Teeth and of certain conclusions as to the nature of the conception of Homology as applied to Teeth which those facts have suggested. The observations concerning teeth form part of an investigation of the Variation of Multiple Parts in general, and I hope that before long the results of this work will be published in a complete form by Messrs. Macmillan, to whom I am much indebted for leave to use the blocks with which this paper is illustrated. In an abstract it is clearly impossible to set forth the precise value and significance of the Study of Variation as a clue to the problems of Descent; but since by most this subject is wholly neglected, it may be well to state in the fewest words why it is that |