EXTINCT MONOTREMES. 270 
ORDER MONOTREMATA. 
As already mentioned, our knowledge of the past history of 
this group is practically a blank; the only fossil forms that 
can be definitely included in it being an extinct representative 
of each of the existing families. 
FAMILY ORNITHORHYNCHID (sura, p. 230). 
GENUS ORNITI(ORHYNCHUS (sujrd, p. 231). 
I. ORNITHORI YNCHUS AGILIS. 
Oruithorhynchus agilis, De Vis, Proc. Roy. Soc., Queensland, 
£Oos, Dp. 35: 
This species is described on the evidence of one ramus of 
the lower jaw, and a tibia, or bone of the lower leg, which 
apparently belonged to an adult animal, and thus indicate 
that the fossil Duck-bill was a considerably smaller animal 
than its existing representative. 
Distribution Queensland. 
FAMILY ECHIDNID (sugra, p. 240), 
GENUS ECHIDNA (supra, p. 241). 
I. ECHIDNA OWENI. 
Echidna owent, Krefft, Ann. Mag. Nat. Hist. ser. 4, vol. i., p. 
113 (1863); Lydekker, Cat. Foss. Mamm. Brit. Mus., 
pt. v., p. 295 (1887). 
Echidna ramsayi, Owen, Phil. Trans., 1884, p. 273. 
A species considerably exceeding in size the existing Papuan 
Proechidna bruijnt, and possibly referable to the same genus. 
Distribution. New South Wales. 
