Hope this helps;
The 'marsupial lion' was extinct well before the aboriginies and thier dingoes got here but some people claim to see them today. It is assumed this is the 'black cat' that is seen in various parts of oz.

bakes - your probably thinking of the Riversleigh thylacine - a relative of the tassi tiger that lived in nth aust rainforrest - along with the 'killer roo'

Id love to get my hands on one of the tassie tigers though.