There are two varieties of this species, the Port Moresby echidna and the hairy echidna.
The Port Moresby beds are Cainozoic. They are highly inclined, and occupy a large range of country along the south coast, and include the Macgillivray Range, to the north-east of Beagle Bay.
Justice is administered by petty sessions in the six magisterial districts into which the possession is divided, with a central court at Port Moresby (which, however, sits elsewhere as necessary) having the jurisdiction of a supreme court, from which in certain cases an appeal lies to the supreme court of Queensland.
Brown and by Wilfred Powell, and in 1882 Dr Otto Finsch, whose name is well known in connexion with scientific work in New Guinea, made valuable explorations in the neighbourhood of Port Moresby and the Loluki river.