134 RECORDS OF THE AUSTRALIAN MUSEUM. 



specimen it is inferior in size to either of these species. Thomas 

 concluded its dimensions were about the same as those of M. rufus. 

 Gould considered it as about equal to M. bennettii. 



The skull differs widely from that of M. rxifus ; in this species 

 the facial region is proportionately greater than in any other 

 kangaroo, and the nasals are correspondingly long and narrow. 

 In M. isabelliiius, as already mentioned, the facial region is the 

 shortest of all the kangaroos, and is, in this respect, nearest allied 

 to M. robushis, in which also the nasals are short and broad. 



As M. isabellinns was known only from a skin, and M. magnus, 

 Owen, from a skull, there was, as suggested by Thomas, a possi- 

 bility that the two were identical. The study of a skull of the 

 former shows that the species are quite distinct. In M. magnus 

 the opening of the lacrymal canal is entirely in the lacrymal bone, 

 the palatal foramina are very long, extending some way into the 

 maxilla, and the posterior palate is very incomplete. 



