Cvi PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 1 898. 



neighbouring Ingewenyaberg, with a map and section by Mr. S. 

 E-yan. Some similar implements from the same district, lent by 

 Mr. Nicol Brown, P.G.S., and some analogous implements of rough 

 quartzite, from Somaliland, lent by the Rev. R. A. Bullen, P.G.S., 

 were also exhibited. 



Prof. Seelet exhibited the humerus of a Plesiosaurian in which 

 the substance of the bone was almost entirely replaced by opal. 

 He explained that the fossil was from the opal-mines of ISTew South 

 "Wales. Externally there is no indication of its internal condition 

 as a pseudomorph, and it had been broken to ascertain its commercial 

 value as opal. It is translucent, of a bluish tint, with a slight red 

 fire. So far as he was aware, it was the only example of a fossil 

 bone in this condition ; and he was indebted to Messrs. Hasluck, 

 the opal-merchants, for the opportunity of placing the specimen 

 before the Pellows. 



The following communications were read : — 



1. 'On some Palaeolithic Implements from the Plateau-Gravels, 

 and their Evidence concerning " Eolithic " Man.' By W. Cunnington, 

 Esq., F.G.S. 



2. ' On the Grouping of some Divisions of Jurassic Time.' By 

 S. S. Buckman, Esq., E.G.S. 



In addition to the specimens mentioned above, the following 

 were exhibited : — 



Elint-implements, exhibited by W. Cunnington, Esq., E.G.S., in 

 illustration of his paper, from his own and Mr. B. Harrison's 

 collections. 



Elints from the Plateau-gravel, Alderbury Hill, near Salisbury, 

 exhibited by Dr. H. P. Blackmore, F.G.S. 



Elint-implements, exhibited by the Rev. R. Ashington Bullen, 

 B.A., F.G.S. 



Flint from Thornton Heath, exhibited by E. A. Martin, Esq., 

 F.G.S. 



New Geological Map of England and Wales, scale: 1 inch = 

 10 miles, by Sir Archibald Geikie, D.Sc, F.R.S. 



Geological Map and Sections of the Heidelberg District (Trans- 

 vaal), scale: 1 inch=3"8 miles, drawn up and presented by A. R. 

 Sawyer, Esq., F.G.S. 



