470 



March 23rd. — On the Ossiferous Cavern of Yealm Bridge, six miles 

 south-east from Plymouth 3 by Capt. Mudge, Roval Engineers, 

 F.G.S., F.R.S., &c.' 



April 13th and 27th. — On the Geology of Coalbrook Dale j by Jo- 

 seph Prestwich, junior, Esq., F.G.S. 



■ ■ A Letter from R. W. Fox, addressed to Sir 



Charles Lemon, Bart., M.P., F.G.S., On the Formation of Mineral 

 Veins. 



May 11th. — On the Silurian and other Rocks of the Dudley and 

 Wolverhampton Coal-field, followed by a Sketch proving the 

 Lickey Quartz Rock to be of the same age as the Caradoc Sand- 

 stone ; by Roderick Impey Murchison, Esq., F.G.S., V'.P.R.S. 



May 25th. — On the part of Devonshire between the Ex and Berry 

 Head and between the Coast and Dartmoor ; by Robert Alfred 

 Cloyne Austen, Esq., F.G.S. 



■ On the supposed existence in Africa of the Lias For- 

 mation ; by Roderick Impey Murchison, Esq., F.G.S. 



A Notice on Maria Island, on the east coast of Van Die- 



men's Land (S. lat. 42° 44', E. Ion. 148° 8') ; by Robert Frank- 

 land, Esq., Surveyor-General of the Colony, and communicated to 

 the Society by Robert W. Hay, Esq., Under Secretary of State for 

 the Colonies. 



A Letter on the Geology of the Country included in the 



south-west quarter, or 55th sheet of the Ordnance Survey; by J. 

 Robison Wright, Esq., F.G.S,, and addressed to Captain Mudge, 

 Roy. Eng., F.G.S., 



On the occurrence of Marine Shells in abed of Gravel, 



at Narley Bank, Cheshire ; by Sir Philip Grey Egerton, Bart., 

 M.P., F.G.S. 



Accompanying Remarks to a section of the Upper Lias 



and Marlstone of Yorkshire, showing the limited vertical range of 

 the species of Ammonites and other Testacea, with their value as 

 Geological Tests ; by Louis Hunton, Esq., and communicated by 

 John Forbes Royle, Esq., F.G.S. 



A Letter from Robert Fitch, Esq., of Norwich, to Ed- 



ward Charlesworth, Esq., F.G.S., on the Discovery of the Tooth of 

 a Mastodon in the Crag at Thorpe, near Norwich. 



June 8th. — Notice respecting a piece of Wood partly petrified by 

 Carbonate of Lime, with some remarks on Fossil Woods which it 

 has suggested ; by Charles Stokes, Esq., F.G.S. 



■ Further Notice on certain peculiarities of structure in 



the Cervical Region of the Ichthyosaurus 3 bv Sir Philip Grey Eger- 

 ton, Bart., M.P., F.G.S., &c. 



A Communication on the Coal-fields on the north- 



western coast of Cumberland, &c. &c. ; by the Rev. Professor 



Sedgwick, M.A., F.R.S., F.G.S., and Williamson Peile, Esq., of 



Whitehaven, F.G.S. 

 November 2nd. — A General Sketch of the Geology of the western 



part of Asia Minor ; by Hugh Edwin Strickland, Esq., F.G.S. 

 November IGth. — On Indications of Changes in the relative Level of 



Sea and Land in the West of Scotland ; by James Smith, Esq., or 



Jordan Hill, F.G.S. 



