984 MESSRS. LISTER AND FLETCHER ON THE [DeC. 13, 



b. Young of a. 



c. An adult. 



d. Nearly adult, not bred. 



Macropus major (2). ' 



a. Adult, bred. 



b. Adult (?) from the Museum of Comparative Anatomy at 



Cambridge. 

 Hahnaturus bennetti (1), adult. 

 Haltna turns derbianus (I), adalt from Museum of Comparative 



Anatomy at Cambridge. 



Halmaturus ualabatus (2). 



a. A young one, not bred. 



b. An adult, bred. 



Petrogale xanthopus (3). 



a. An adult, bred. 



b. An adult, bred. 



c. Young of b, not bred. 



DendroJagus inustus (1), probably not bred, 

 Hypsiprymyius gaimardi (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 riifus (a). 



The animal died in the Society's Gardens on Oct. 12th, It was 

 an adult; and a young one (6) only 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 dis- 

 cussion, 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 J 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. 



On opening the median chamber from the dorsal side (fig. 1, p. 98.5) 

 the mucous membrane presented a red, highly vascular appearance, 

 and it was covered with a soft mucous secretion. When the uro- 

 genital 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 auother, that of the urethra (probe 

 b). These two openings are situated in the middle line ; on either 



