674 
Macboptts ajax, Owen. 
Ufaeropua ajax, Owen, Quart. Joum. Geol. Soc., 1859, xv., p. 185, note. 
Obs. This name was applied to a lower jaw which does not appear to have been 
referred to in any of Prof. Owen’s subsequent Memoirs. 
Zoe. and Horizon. Darling Downs {H. Hughes — Colin. 'Wprcester Nat. Hist 
Soc.) — Pluviatile deposits. 
Macroptts EOBirsTTis, Oould. 
Petrogale rdbuata, Gould, Mon. Macropodidse, 1841, t. 0. 
Osphranter rohustus. Gray, List Spec. Mam. Brit. Mua., 1843, p. 91. 
Macropus rohuslus, Lydekker, Cat. Foss. Mam. Brit. Mus., Pt. 6, 1887, p. 222. 
Loc. and Horizon. Gowrio, Darling Downs (G. F. Bennett — Colin. Brit. Mus.) 
— Pluviatile deposits. 
Maceoptjs, sp. ind. (a). 
Maaropus, sp., Owen, Descrip. Oat. Mam. Aves. R. Coll. Surgeons, 1845, p. 326, No. 1517. 
Ohs. A ramus of a lower jaw was retained by Prof. Owen in the Boyal 
College of Surgeons Catalogue as a distinct species. It presented evidence of more 
molars in use at one time than in the recent Macropits laniger or M. major. 
Loc. and Horizon. Condamine Eiver, west of Moreton Bay {Bir T. L. Mitchell 
— Colin. College Surgeons, London) — Pluviatile deposits. 
Maceoptjs, sp. ind. (b). 
Macropus, sp., Owen, Extinct Mam. Australia, 1877, p. 491, 1. 114. 
Ohs. An almost entire femur has been described by Sir B. Owen, and does not 
appear referable to any described species. 
Loc. and Horizon. King’s Creek, Darling Downs — Pluviatile deposits. 
Genus— LEFTOSIAOOH, Owen, 1873. 
(Proc. Roy. Soc., xxi., p. 380.) 
Leptosiason oeacilis, Otoen. 
Lcptosiagon gracilis, Owen, Proc. R. Soc., 1873, xxi., p. 386. 
„ ,, Owen, Phil. Trans., 1874, clxiv., Pt. 2, p. 785, t. 76, f. 11-15. 
„ ,, Owen, Extinct Mam. Australia, 1877, p. 450, t. 89, t. 11-15. 
Ohs. Prof. Owen considers Lcptosiagon to bo a sub-genus of Macropus. He 
adds — “ The distinctive dental character of the present sub-genus is in the sculpturing 
of the hind surface of the molars,” and the mandible appears to have been unusually thin 
in proportion to its depth. Mr. Lydekker remarks that the specimen on which this 
species was founded presents no distinguishable difference from Macropus (Pachysiagon) 
ferragus, Owen.* 
Loc. and Horizon. The only locality afforded is that of “ Queensland.” Probably 
from Darling Downs. — Pluviatile deposits. 
Genus— OSPHRANTEB, Gould, 1841. 
(Proc. Zool. Soc., Pt. ix., p. 80.) 
OspHEASTEE CooPEEi, Owen. 
Osphranter Cooperi, Owen, Proc. R. Soc., 1873, xxi., p. 128. 
„ „ ,, Phil. Trans., 1874, clxiv., Pt. 1, p. 261, t. 21, f. 17 and 18. 
„ ,, ,, Extinct Mam. Australia, 1877, p. 412, t. 84, f. 17 and 18. 
Macropus Cooperi, Lydekker, Cat. Foss. Mam. Brit. Mus., 1887, Pt. 5, p. 234. 
Obs. This name was applied by Prof. Owen to the “ fore part of the left man- 
dibular ramus of an aged individual of a Wallaroo, of the size of Osphranter rohustus.” 
Loc. and Horizon. Darling Downs, Queensland — Pluviatile deposits. 
* Cat. Foss. Mam. Brit, Mus., 1887, Pt. 5, p. 231. 
