No Australian type of Marsupial has been discovered in the Upper Eocene strata, nor any edentate mammal.
"Critiques and Addresses"
Thomas Henry Huxley
They are however without teeth only in the front of the jaw in all, but with a few molars in some, the Indian forms however are truly edentate, having no teeth at all.
"Natural History of the Mammalia of India and Ceylon"
Robert A. Sterndale
Whether that common ancestor was an edentate, an Insectivore, or Creodont, or something more primitive than them all, is disputed.
"The Story of Evolution"
Joseph McCabe