10 ON SOME POINTS IN THE ANATOMY OF KANGAROOS, 



ualabatus, H. derbianus, H. agilis, H. dorsalis, Petrogale peni- 

 cillata, P. exanthopus, Osphranter rufus, 0. robustus, and 

 Onychogalea frsenata. 



3. The remarkable condition presented by Macropus Major in 

 which, unless very exceptionally, there is no direct communication 

 even after young have been produced has been verified in twenty- 

 eight specimens. 



4. In virgin animals of H. ruficollis, H. dorsalis, P. penicillata, 

 O. robustus, and O. rufus the direct communication did not exist, 

 but in one specimen of P. p. and one of H. ualabatus the direct 

 communication was in process of formation but still incomplete ; 

 and these two specimens seem to show that the aperture of 

 communication arises probably not by a mere rupture of the 

 intervening portion of the wall of the urogenital canal, but by 

 an involution of the latter canal growing backwards to meet the 

 cavity of the median portion of the vagina when the latter has 

 reached its maximum backward extension. My own observations 

 show that it is possible for the direct communication to exist in 

 virgins, while those of other observers show that exceptionally 

 this actually is the case ; but more usually it would seem to be 

 formed late in life, probably during pregnancy or at parturition. 



The acquisition of this material would have cost me a vast 

 amount of trouble but for the great kindness and ready help of 

 a number of gentlemen, to whom my hearty thanks are due and 

 are hereby accorded. Especially am I indebted to my friend and 

 colleague, Mr. R. T. Baker, for much assistance in the field, and 

 for the diagrams and drawings with which the reading of this 

 paper was illustrated ; also to my friend, Mr. F. Morley, for 

 another donation of valuable specimens ; also to George Hill, 

 Esq., for an invitation to, and the most hospitable treatment at, his 

 station, Mokai Springs; also to S. Cox, Esq., for an invitation 

 to visit Rawdon ; likewise to Messrs. Brown, A. Cox and Belcher 

 for their guidance and help in procuring some good shooting, 

 also to several gentlemen of whose proffered kindness I was 

 unable to avail myself. 



