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Nototherium, nō-tō-thē′ri-um, n. a genus of gigantic fossil kangaroo-like marsupials, found in Australia.

The fossils from this section, as determined by Professor Owen, are “Diprotodon Australis, Macropus titan, Thylacoles, Phascolomys, Nototherium,” crocodile teeth, etc.

The utter extinction of these gigantic species, comprising diprotodon, nototherium, and zygomaturus, and other species, grasseaters and flesheaters alike, can only be accounted for by a great change of climate, and great and long-continued droughts, reducing the herbage and causing the remaining living animals to crowd into the drying-up lagoons and lakes, there to become bogged in thousands, and die as the stock die in the waterholes after a long drought.

They belong to the genera Diprotodon and Nototherium of Professor Owen.