Geological Society of London. 183 
Prof. Bernhard von Cotta, Mr. David Page, Prof. James Nicol, Sir 
Walter ©. Trevelyan, Bart., Mr. John Waterhouse, and others. 
The Ballot for the Council and Officers was taken, and the following were duly 
elected for the ensuing year :—President: R. Etheridge, Esq., F.R.S.  Vice-Prest- 
dents: Sir P. de M. Grey-Egerton, Bart., M.P., F.R.S.; John Evans, D.C.L., 
LL.D., F.R.S.; J. W. Hulke, Esq., F.R.S.; Prof. A. C. Ramsay, LL.D., F.R.S: 
Secretaries: Prof. T. G. Bonney, M.A., F.R.S.; Prof. J. W. Judd, F.R.S. 
Foreign Secretary: Warington W. Smyth, Esq., MAL BLES. ° Treasurer: J. 
Gwyn Jeffreys, LL.D., F.R.S. Council: Rev. J. F. Blake, M.A.; Prof. T. G. 
Bonney, M.A., F.R.S.; W. Carruthers, Esq., F.R.S.; Sir P. de M. Grey-Egerton, 
Bart., M.P., F.R.S.; R. Etheridge, Esq., F.R.S.; John Evans, D.C LL.D: 
F.R.S.; Lieut.-Col. H. H. Godwin-Austen; J. Olark Hawkshaw, Esq., M.A. ; 
Henry Hicks, M.D. ; W. H. Hudlestone, Esq., M.A.; Prof. T. McKenny Hughes, 
M.A.; J. W. Hulke, Esq., F.R.S.; J. Gwyn Jeffreys, LL D., F.R.S. ; Prot.) 
Rupert Jones, F.R.S. ; Prof. J. W. Judd, F.R.S.; Prof. N. S. Maskelyne, M.A., 
F.R.S.; J. Morris, Esq., M.A.; J. A. Phillips, Esq. ; Prof. J. Prestwich, M.A., 
F.R.S.; Prof. A. C. Ramsay, LL.D., F.R.S.; Prof. H. G. Seeley, F.R.S. ; War- 
ington W. Smyth, Esq., M.A., F.R.S.; H. C. Sorby, LL.D., F.R.S. 
II.—Feb. 25, 1880.—Robert Etheridge, Esq., F.R.S., President, in 
the Chair.—The following communications were read :— 
1. On the Geology of Anglesey.” By Prof. T. McKenny Hughes, 
M.A. 
The author brought forward evidence to show that, resting on the 
central gneissic axis of Anglesey, there was a series of conglomerates 
which he referred to the base of the Cambrian; that the Lingula-flags 
had not yet been recognized; that the conglomerates were followed 
by the brown sandstones hitherto referred to Caradoc, but which he 
identified by the included fossils with Tremadoc; that the lower part 
of the Black-Shale Group was Arenig, as shown by the Graptolites ; 
while he thought that the higher parts of the Black-Shale Group 
might turn out to be Lower Bala; that the Black Shales pass under 
the Gnarled Schists. He then adduced evidence to show that these 
Gnarled Schists were not foliated or in any way true metamorphic 
rocks, but only crumpled laminated beds, in which all the alteration that 
had taken place was of the nature of vein-structure, and a kind of 
universal slickenside, consequent upon the crushing of a rock consisting 
of thin lamine of different texture; and suggested that the whole 
might be, like the green slates, etc., of Chapel-le-dale, in Yorkshire, 
the water-sorted out-lying equivalents of volcanic rocks elsewhere, and 
be contemporaneous with the Snowdon volcanic series. 
9. «Notes on the Strata exposed in laying out the Oxford Sewage 
Farm at Sandford-on-Thames.” By E. 8. Cobbold, Esq., F.G.8., 
Assoc. M. Inst. C.E. 
The beds noticed in this paper belong to the Kimmeridge Clay and 
the upper and middle part of the Oxford Oolite. They were exposed 
(over an area of about 13 mile by 1 mile) in making deep trenches for 
a sewage farm, about four miles 8. of Oxford. The author described 
variations in the Coralline Oolite and Coral Rag, which become, in 
places, a marl without corals. ‘The Calcareous Grit also is variable in 
character. On either side of this tract, at Headington and Cumnor, 
are coralliferous strata. ‘Thus it appears to indicate a gap in the reef. 
The clay may indicate the proximity of some river, which thus caused 
