234 Geological Society: — 



Cambrian. The only fossil that lias been found in them is a sup- 

 posed worin-burrow. In conclusion the author expresses the opinion 

 that the Stiper-stones quartzites are of Arenig age. 



2. " On the Affinities of the Mosasauridae, Gervais, as exemplified 

 in the bony structure of the fore fin." By Prof. Owen, C.B., F.R.S., 

 F.G.S., &o. 



3. " On new Species of Procolophon from the Cape Colony, pre- 

 served in Dr. Grierson's Museum, Thornhill, Dumfriesshire ; with 

 some Remarks on the Affinities of the Genus." By Harry Govier 

 Seeley, Esq., F.L.S., F.G.S., &c, Professor of Geography in King's 

 College, London. 



4. " On the Microscopic Structure of the Stromatoporidse, and on 

 Palaeozoic Fossils mineralized with Silicates, in illustration of 

 Eozoon." By Principal Dawson, LL.D., F.R.S., F.G.S. 



5. " On some Devonian Strornatoporidae." By A. Champernowne, 

 Esq., F.G.S. 



6. " On a new Species of Lofiusia from British Columbia." By 

 George M. Dawson, D.Sc, F.G.S., Assoc. P. S. M., of the Geological 

 Survey of Canada. 



June 19, 1878.— John Evans, Esq., D.C.L., F.R.S., Yice-President, 



in the Chair. 



The following communication was read : — 



1. "On the Section of Messrs. Meux & Co.'s Artesian Well in the 

 Tottenham Court Road, with notices of the Well at Crossness, and 

 another at Shoreham, Kent; and on the probable Range of the 

 Lower Greensand and Palaeozoic Rocks under London." By Prof. 

 Prestwich, M.A., F.R.S., Y.P.G.S. 



The well-known boring at Kentish Town in 1856 showed the 

 absence at that point of Lower Greensand, the Gault being im- 

 mediately succeeded by hard red and variegated sandstones and 

 clays, the age of which was at first doubtful, but which were finally 

 considered by the author to approach most nearly to the Old Red 

 Sandstone near Frome, and to the Devonian sandstones and marls 

 near Mons, in Belgium. The existence of some doubt as to this 

 identification rendered the boring lately made at Messrs. Meux's 

 brewery particularly interesting ; and the method of working adopted 

 by the Diamond Boring Company, by bringing up sharply cut cores 

 from known depths, gave special certainty to the results obtained. 

 The boring passed through 652^ feet of Chalk, 28 feet of Upper 

 Greensand, and 160 feet of Gault, at the base of which was a seam, 

 3 or 4 feet thick, of phosphatic nodules and quartzite pebbles. 

 Beneath this was a sandy calcareous stratum of a light ash-colour, 

 passing into a pale or white limestone, and this into a rock of oolitic 

 aspect. Casts and impressions of shells found in this bed showed it 

 to be the Lower Greensand, whose place it occupied. The boring was 

 carried further in the hope of reaching the loose water-bearing 

 sands of this formation ; but the rock became very argillaceous ; and 



