CONTENTS. 



PART I. 



I. On the Geology of Southern Pembrokeshire. By H. T. De la Beche, 



Esq. F.G.S. F.R.S. F.L.S. Sfc P- I 



II. On the Lias of the Coast, in the Vicinity of Lyme Regis, Dorset. By 



H. T. De la Beche, Esq. F.G.S. F.R.S. F.L.S. Sfc. . . p. 21 



III. Observations on the Strata at Hastings in Sussex. By Thomas 



Webster, Esq., Secretary to the Geological Society. . . . p. 31 



IV. Observations on the PurbecJc and Portland Beds. By Thomas 



WehsXer, Esq., Secretary to the Geological Society. . . • ?• 37 



V, Observations on Belemnites. By Mr. J, S. Miller, A. L.S. SfC. Com- 

 municated by the Rev. W. D. Conybeare, F.G.S. F.R.S. Sfc. .p. 45 



VI. Observations on the Genus Actinocamax. By Mr. J. S. Miller, A.L.S. 



Sfc p. 63 



VII. On the Geology of Rio de Janeiro. By Alexander Caldcleugh, Esq. 



F.G.S p. 69 



VIII. On a recent Formation of Freshwater Limestone in Forfarshire, and on 

 some recent Deposits of Freshwater Marl ; with a Comparison of 

 recent with ancient Freshwater Formations ; and an Appendix on the 

 Gyrogonite or Seed-vessel of the Chara. By Charles Lyell, Esq. 

 F.G.S. F.R.S. F.L.S. Sfc p. 73 



IX. Geological Sketch of the North-western Extremity of Sussex, and the 

 adjoining Parts of Hants and Surrey. By Roderick Iinpey Mur- 



chison, Esq. Sec. G.S., F.R.S. Sec. Sfc p. 97 



X. On the Chalk and Sands beneath it (usually termed Green-sand) in the 

 Vicinity of Lyme Regis, Dorset, and Beer, Devon. By H. T. De la 

 Beche, Esq., F.G.S. F.R.S. F.L.S. Sfc p. 109 



XI. On the Formation of the Valley of Kingsclere and other Valleys, by the 

 Elevation of the Strata that inclose them ; and on the Evidences of the 

 original Continuity of the Basins of London and Hampshire. By the 

 - Rev. W. Buckland, S.T.P. F.R.S. F.L.S. President of the Geolo- 

 gical Society, and Professor of Mineralogy and Geology in the Uni- 

 versity of Oxford, Sfc. p. 119 



