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Show 390 THE SECRETARY ON ADDITIONS TO THE MENAGERIE. [May 1, have a nacreous appearance on account of the thickness of their muscular walls. These sacs end blindly and are not, as I at first thought them, the dilated ends of the muscular duct of the spermiducal glands. They occupy two or three segments and open on to the exterior in the xviiith segment through the penes. Their walls are excessively thick and the lumen therefore is not wide. The penis on to which each of them opens is a portion of the body-wall which projects ; it does not appear to be simply the everted portion of the sacs. The extremity of the organ is vascular and has a wide lumen ; but where it traverses the body-wall the lumen of the bursa is narrow. The two sperm-ducts become united just where they dip into the thickness of the walls of the bursa; they are ciliated on their passage through the bursa and open into its interior. The spermiducal glands have the structure which has been referred to in the definition of the genus. One pair of them opens into the bursa near to, but quite independently of, the orifice of the sperm-ducts; the other opens in front of this on to the xviith segment. The accompanying diagram (woodcut, fig. 3) shows the relations of the different parts of the male efferent apparatus. The ovaries and oviducts are in the usual places for these organs to occupy. There is a single pair of spermathecae in the viith segment; they are long and tubular without a diverticulum. The very extremity of the pouch differs from the rest in that its walls are very thin; this is brought about by the absence or very slight development of the muscular layers aud the thinness of the epithelium. Elsewhere the epithelium is tall and folded. The pouch was filled with spermatozoa, arranged in a peculiar fashion. The heads of the spermatozoa were attached to the cells lining the pouch and presented quite a regular appearance, so much so that they might easily be mistaken for cilia. M a y 1, 1894. Dr. A. GUNTHER, F.P.S., Vice-President, in the Chair. The Secretary read the following report on the additions to the Society's Menagerie during the month of April 1894 :- The total number of registered additions to the Society's Menagerie during the month of April was 160, of which 87 were bv presentation, 6 by birth, 49 by purchase, 2 received in exchange, and 16 on deposit. The total number of departures during the same period, by death and removals, was 83. Amongst these I wish to call particular attention to the collection of Mammals and Eeptiles sent to us by Dr. J. Anderson, F.R.S., being the proceeds of his recent expedition to Egypt and Suakiro. |