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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



The following communications were read : — 



1 . " The Microscopic Characters of the Vitreous Kocks of Montana, 

 U.S." By F. Rutley, Esq., F.G.S. ; with an Appendix by James 

 Eccles, Esq., F.G.S. 



2. " On the Microscopic Structure of Devitrified rocks from Bedd- 

 gelert, Snowdon, and Skomer island." By E. Rutley, Esq., F.G.S. 



3. " The Date of the last Change of Level in Lancashire." By 

 T. Mellard Eeade, Esq., C.E., E.G.S. 



The following specimens were exhibited : — 



Specimens of arsenical silver-ore from Gunnison, Colorado, ex- 

 hibited by H. Bauerman, Esq., F.G.S. 



Rocks and rock-sections, exhibited by F. Rutley, Esq., in illustra- 

 tion of his papers. 



April 27, 1881. 



R. Etheeidge, Esq., F.R.S., President, in the Chair. 



Samuel Gerrard Kirchhoffer, Esq., M.A., Yately Grange, Farn- 

 boro' Station ; Arthur Henry Shakespere Lucas, Esq., The Leys, 

 Cambridge ; and Frederick Thomas Nelson Spratt, Esq., Lieut. R.E. 

 Clare Lodge, Tunbridge Wells, were elected Fellows of the Society. 



The following communications were read : — 



1. "On the precise Mode of Accumulation and Derivation of the- 

 Moel Tryfan Shelly Deposits ; on the Discovery of similar high-level 

 Deposits along the Eastern Slopes of the Welsh mountains ; and on 

 the Existence of Drift-zones showing probable Variations in the Rate 

 of Submergence." By D. Mackintosh, Esq., F.G.S. 



2. " On the Correlation of the Upper Jurassic rocks of England 

 with those of the Continent." By the Rev. J. F. Blake, M.A., 

 F.G.S. Part I. The Paris basin. 



3. "On Fossil Chilostomatous Bryozoa from the Yarra-Yarra, 

 Victoria, Australia." By Arthur William Waters, Esq., F.G.S. 



The following specimens were exhibited : — 



Upper molar of an extinct species of Elephant from the Sivalic 

 Older Pliocene (?), and Plant-remains in ironstone nodules from Coal- 

 brook Dale, exhibited by E. Charlesworth, Esq., F.G.S. 



Specimens from Moel Tryfan and Frondeg gravel-pit, Denbigh- 

 shire, exhibited by D. Mackintosh, Esq., in illustration of his paper. 



