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Show 984 MESSRS. LISTER AND FLETCHER ON THE [Dec. 1 3, b. Young of a. c. A n adult. rfu Nearly adult, not bred. Macropus major (2). a, Adult, bred. . b. Adult (?) from the Museum of Comparative Anatomy at Cambridge. Halmaturus bennetti (1), adult. Halmaturus derbianus (1), adult from Museum of Comparative Anatomy at Cambridge. Halmaturus ualabatus (2). a. A young one, not bred. b. An adult, bred. Petrogale xanthopus (3). a. A n adult, bred. b. A n adult, bred. c. Young of b, not bred. Dendrolagus inustus (1), probably not bred. Hypsiprymnus guimardi (1), bred. For permission to examine the two specimens from the Museum at Cambridge we are indebted to the courtesy of Mr. J. W . Clark. The other specimens are from the Gardens of the Society, and have been most liberally placed at our disposal by Mr. W . A. Forbes. In the cases in which it is not stated whether young have been born or not, we have been unable to ascertain this point. It will be convenient to commence the account of our specimens with the description of the Macropus rufus (a). The animal died in the Society's Gardens on Oct. 12th. It was an adult; and a young one (b) only 1-1^ in. long was found attached to a teat. The diminutive size of the young showed that it had only recently been born, and hence that the generative organs were in a condition most favourable for the study of the point under discussion, as they had just passed their condition of functional activity when the animal died. External examination of them showed a corpus luteum, measuring a little more than ^ in. in its longest diameter, in the left ovary. The blood-vessels supplying the region were much dilated, giving it a very lurid appearance. The median vaginal chamber appeared more dilated, especially at its posterior part, than in the other specimens we have examined. Ou opening the median chamber from the dorsal side (fig. 1, p. 985) tbe mucous membrane presented a red, highly vascular appearance, and it was covered with a soft mucous secretion. When the urogenital canal was opened, the median chamber was seen to open into it posteriorly by a distinct projecting orifice \ inch in diameter. Immediately below this opening is another, that of the urethra (probe b). These two openings are situated in the middle line ; on either |