The Collaborative International Dictionary of English v.0.48:

Nototherium \No`to*the"ri*um\, n. [NL., fr. Gr. no`tos the south
   + qhri`on a wild animal.] (Zool.)
   An extinct genus of gigantic herbivorous marsupials, found in
   the Pliocene formation of Australia.
   [1913 Webster]