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Show 1893.] HON. W. ROTHSCHILD ON EGG OF DUCK-BILL, ETC. 505 June 6, 1893. Sir W. H. FLOWER, K.C.B., LL.D., F.R.S., President, in the Chair. The Secretary read the following report on the additions to the Society's Menagerie during the month of M a y 1893:- The total number of registered additions to the Society's Menagerie during the month of M a y was 165, of which 61 were by presentation, 8 by birth, 54 by purchase, 2 by exchange, and 40 on deposit. The total number of departures during the same period, by death and removals, was 104. Amongst the additions I may invite special attention to the following:- A young female Water-buck (Cobus ellipsiprymnus), born in the Menagerie M a y 4,1893, being, so far as is known, the first Antelope of this species that has been bred in captivity. For our pair of this beautiful species we are indebted to the liberality of Mr. G. S. Mackenzie, F.Z.S. The male was received June 30, 1890 (see P. Z. S. 1890. p. 589), and the female on May 26, 1891 (see P. Z. S. 1891, p. 326). Both of these animals were obtained in the territory of the British East African Company, where the species appears to be abundant (see Willoughby's ' East Africa and its Big Game,' page 288). I exhibit a water-colour drawing by Smit (Plate X X X I X . ) of this interesting young auimal, which generally resembles the adult, though perhaps rather more rufous in colour. The Council have resolved to present to Mr. G. S. Mackenzie the Silver Medal of the Society in recognition of this successful addition to the list of acclimatizable Antelopes. The Hon. Walter Rothschild, F.Z.S., exhibited and made remarks upon the following objects : - 1. A specimen of the egg of the Duck-bill (Ornithorhynchus anatinus), stated to have been taken out of the pouch of the mother in Queensland. 2. The leg-bones of a large species of JEpyornis from Southwestern Madagascar, together with a perfect egg of the same extinct bird. 3. A n enlarged photograph, by Mr. Williams of Honolulu, representing an enormous colony of Albatrosses on Laysan Island, in the North Pacific. Tbe Albatross portrayed was the new species, Biomedea immutabilis, lately described by Mr. Rothschild, Bull. B. O. C. no. ix p. xlviii. The breeding-colony of this species was stated to occupy an area of nearly four square miles in Laysan Island. Another area of about two square miles in the same island was occupied by Biomedea bracliyura. 4. A series of Lepidoptera from Jamaica, with their accompany- |