1858.] OWEN ZYGOMATURUS. 541 



"gutters," "leads," or " runs" of auriferous quartzose gravel — or 

 "wash-dirt" — are met with on the surface of the slate or on pipe- 

 clay. The pits vary considerably in the sections they afford. 



The fragments of wood in the gravel are of all sizes, from tree- 

 trunks 3 or 4 feet in diameter, to branches and twigs ; and this 

 drift is throughout impregnated with woody particles, giving it a 

 black appearance, especially towards the bottom. The cones of the 

 " honeysuckle," or Banksia *, have been found not unfrequently in 

 this drift. These are very brittle ; but the wood is often well pre- 

 served. Thin horizontal layers of very hard rock are imbedded in 

 the gravel. 



Some of the "gutters" or "leads" were drawn by the author on 

 plans, showing their course beneath this drift across the present 

 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 "French- 

 man'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 (" quartz-reef"), 

 are shallow at first, 2 or 3 feet in depth, and gradually get deeper. 



4. On some Outline-drawings and Photographs of the Skull 

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

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



[Abstract.] 



(The publication of this Memoir is unavoidably postponed.) 



About a month since, Prof. Owen received from Sir R. 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 Sir R. 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, 



* Some of the cones brought by Mr. Redaway were submitted by Sir R. Mur- 

 chison to the late Dr. Robert Brown, who identified them as belonging to the 

 Banksia. 



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