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Show 1S93.] DATES OF DELIVERY OF THE 'PROCEEDINGS.' 435 May 2, 1893. Sir W . II. F L O W E R , K C.B., LL.D., F.B.S., President, in the Chair. The Secretary read the following report on the additions to the Society's Menagerie during the month of April 1893 :- The total number of registered additions to the Society's Menagerie during the month of April was 130, of which 58 were by presentation, 18 by birth, 24 by purchase, 18 were received in exchange, and 12 ou deposit. The total number of departures during the same period, by death and removals, was 99. Amongst these special attention may be called to :- 1. A young male Orang (Simia satyrus) brought home from Singapore, and presented April 19th by Thomas Workman, Esq., of Belfast and Singapore. 2. A White-bellied Hedgehog (Erinaceus albiventer), from Somaliland, presented by H. W . Seton-Kerr, Esq., F.Z.S., April 24th. This species is new to the Collection. 3. A female Gibbon, brought home from North Borneo, and presented by Leicester P. Beaufort, Esq., A pril 25th. This Gibbon is generally of a dark ashy colour with a black patch on the crown, and blackish on tbe lower surface and inner sides of the limbs. 1 am inclined to refer it to one of the varieties of Hylobates muelleri, Martin. It has been placed along with the male Hainan Gibbon (Hylobates hainanus), received Nov. 1st, 1892 (see P. Z. S. 1892, p. 541), and they agree well together. Mr. Sclater called attention to the protrusion of a fleshy mass from the cloaca occasionally exhibited by the Greater Vasa Parrot (Coracopsis vasa), as recorded by him, P. Z. S. 1884, pp. 410, 562 ; and stated that, owing to the kindness of the Hon. Henry S. Littleton, of 22 Butland Gate, he had himself lately had an opportunity of observing another case of this curious phenomenon. A bird of this species, for several years in that gentleman's possession, was stated to be in the habit of exhibiting this appearance every spring, and did so for some time in Mr. Sclater's presence on the 28th ult. Mr. Sclater was able to make a careful examination of the bird, and had convinced himself that the strange appearance was caused by the protrusion of the inner membrane of the lower portion of the cloaca, which was abnormally swollen at this time of year, and could be protruded and withdrawn at the will of the bird. Mr. Sclater was able to effect its partial protrusion after withdrawal by pressure ou the cloaca. He had no doubt the bird was a female, as in the other cases previously observed. Tbe extraordinary point w7as that no exactly similar phenomenon was known to occur in any other species of bird. Mr. Sclater laid on the table the following List of the dates of the receipt from the printers of the sheets of the Society's ' Proceedings' from 1831 to 1859 inclusive, which had been drawn up |