376 Reports and Proceedings. 



implements, and this idea is supported by MM. Hamy, Cotteau 

 Marquis de Vibraye, Dupont, de Mortillet, and De Worste. 



To sum up, the evidence of man in the Tertiary epoch seems to 

 rest upon the evidence of the scratched bones, marked, according to 

 M. Desaoyers, by man ; according to Sir C. Lyell, gnawed by some 

 animal ; and upon the stronger evidence in the shape of rudely- 

 fashioned flint implements, which is supported by many high authori- 

 ties, but rejected by others. F. J. B. 



III. — A Visit to Sydney anb the Cudgegong Diamond Mines. 

 By Angus Mackay. 8vo. pp. 64. (Melbourne, 1870.) 



THIS is an interesting sketchy narrative of Mr. Macka3''s visit to 

 the Cudgegong Diamond Mines. Commencing with an account 

 of his journey from Melbourne to Sydney, he gives a notice of the 

 present state of the latter city and of the changes it has of late years 

 undergone. Then he visits the Lithgow Valley Coal-field, and 

 afterwards takes coach to Mudgee, a thriving town, pleasantly 

 situated in an open level country, through which the Cudgegong or 

 Mudgee river flows. The nearest diamond workings are at a place 

 called Two Mile Flat, twenty-two miles distant to the westward ; 

 two or three miles from this hamlet is the head-quarters of the 

 Mudgee Gold and Diamond Washing Company. It is a portion 

 of the ancient river-bed, considered to be of Older Pliocene age, 

 thirty or forty feet above the present channel of the river, which 

 has been found to be rich both in gold and diamonds, — indeed, the 

 gold alone should give excellent returns if the ground be worked 

 with ordinary skill. The gold is derived from the Upper Silurian 

 rocks. The great question of interest, however, is. Whence come the 

 Diamonds ? Upon this point opinions are at variance. Judging 

 from the facts that the diamonds found in the ancient Drift are 

 almost without exception perfectly formed and unabraded, whereas 

 those found in the present river alluvium show marks of the ill-usage 

 they have met with among the pebbles and boulders, it is inferred 

 that the diamonds were formed in the older Drift after its deposition. 

 On the other hand, the diamonds may have been brought with the 

 disintegrated rocks which supplied the Drift. Further observations 

 are needed before a definite conclusion on the subject can be arrived 

 at. Meanwhile, it is interesting to have an account of the processes 

 carried on in these gold and diamond workings, which Mr. Mackay 

 has set forth in a popular manner in the little pamphlet now before us. 



E-EIPOS/TS .A-IsTID IPiaOOIEIEIDin^a-S. 



Geological Society of London, — I. May 24:th, 1871. — Prof. John 

 Morris, Vice-President, in the Chair. The following communications 

 were read : — 1. "On the principal Features of the Stratigraphical 

 Distribution of the British Fossil Lamellibranchiata." By J. Logan 

 Lobley, Esq., F.G.S. 



In this paper the author showed, by means of diagrammatic tables, 



