Prof. Owen on the Skull 0/ Zygomaturus trilobus. 403 



gullies and from hill to hill ; especially the " Black Lead " and the 

 "White Lead," underlying Little Hill, one of them having a branch 

 from under Clarke's Hill, and both uniting before passing under 

 Slaughter Yard Hill. 



At Ballaarat, Mr. Redaway observed, in a pit on Sevastopol 

 Hill, two layers of bluestone (the second bed about 80 feet thick) 

 above the gold-drift or " wash-dirt," together with stiff clays and 

 quartzose gravels. Here the author traced some gold-runs — the 

 "Frenchman's Lead," " White Horse Lead," and "Terrible Lead," 

 running parallel to each other in a direction transverse to that of 

 the present gully, and from hill to hill. Like all other " leads," 

 these rise generally in the neighbourhood of a quartz-vein (or 

 "quartz-reef •"),' are shallow at first, 2 or 3 feet in depth, and gra- 

 dually get deeper. 



4. " Notes on some Outline-drawings and Photographs of the 

 Skull of Zygomaturus trilobus, Macleay, from Australia." By Prof. 

 Owen, F.R.S., F.G.S. 



About a month since Prof. Owen received from SirR. Murchison 

 seven photographs, three of which are stereoscopic, of perhaps the 

 most extraordinary Mammalian fossil yet discovered in Australia. 



These photographs, with a brief printed notice of their subject by 

 William Sharp Macleay, Esq.,F.L.S., and some MS. notes by J. D. 

 Macdonald, M.D., R.N., had been transmitted to SirR. Murchison 

 by His Excellency Governor Sir W. Denison, from Sydney, New 

 South Wales ; and by desire of Sir Roderick the Professor brought 

 the subject under the notice of the Geological Society of London, to 

 whom Sir Roderick desires to present the photographs on the part 

 of His Excellency Sir W. Denison. 



Professor Owen had some weeks previously received from George 

 Bennett, Esq., F.L.S., of Sydney, outlines of the same fossil skull, 

 made by him on the reception of the specimen by the authorities of 

 the Australian Museum at that town ; and the Professor had penned 

 notes of his comparisons of these sketches before receiving the 

 photographs and descriptions of the fossil skull from Sir R. I. Mur- 

 chison. 



This unique and extraordinary skull of a probably extinct Mam- 

 mal, together with other bones, but without its lower jaw, were 

 found at King's f 'reek, Darling Downs, — the same locality whence 

 the entire skull and other remains of the Diprotodon have been ob- 

 tained. 



Mr. Macleay has described the fossil under notice as belonging 

 to a marsupial animal, probably as large as an Ox, bearing a near 

 ajjproach to, but differing generically from, Diprotodon. He has 

 named it Zyyomuturus trilobus. The skull has transversely ridged 

 molars, and a long process descending from the zygomatic arch, as 

 in the Megatherium and Diprotodon, and exhibits an extraordinary 

 widtli of tlie zygomatic arches. The skull at its broadest part, 

 acro.s8 the zygomata, is 15 inches wide, and is 18 inches long. In 

 Diprotodon the skull is about 3 feet long by 1 foot 8 inches broad : 

 80 that while the latter must have had a face somewhat like that of 



