2 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. 



A worked Flint from the Gravel-beds (? Pleistocene) in the 

 Yalley of the Tomb of the Kings, near Luxor (Thebes), Egypt, ex- 

 hibited by John E. H. Peyton, Esq., F.G.S. 



Specimens of Valuta Lamberti from the Coralline Crag, and of 

 Cyprina angulata from the Blackdown beds, exhibited by W. H. 

 Dalton, Esq., E.G.S. Upon these specimens the following note by 

 Mr. Dalton was read : — " The attention of the Society being directed 

 to the Blackdown beds, it may be worth while to note a peculiar 

 feature in the specimen exhibited of Oyprina angulata, Fleming, 

 belonging to the Museum of Practical Geology, and brought here to- 

 night by the kind permission of the Director- General of the Geolo- 

 gical Survey. 



" The valve, lying with its concavity downwards, has but partially 

 imbedded itself in the sediment, and in subsequent silicification a 

 film of chalcedony has been deposited on the free surface of the 

 matrix within the shell. 



" Similar surfaces are shown by the casts of Valuta Lamberti, 

 Sowerby, also here exhibited, from the collection of Mr. H. Stopes, 

 F.G.S. These were found in a small quarry of the Coralline Crag 

 rock-bed at Aldborough. They show that as the shells lay on the 

 sea-bed, the upper part of each whorl was occupied by gases arising 

 from the decomposition of the animal, to the exclusion of the cal- 

 careous mud, which could only rise to the crest of the arch of each 

 successive suture. Its surface within the shell was not a plane, like 

 that of the Blackdown specimen, but shows, for each whorl, an 

 upward bulge in the centre, an annular depression near the edge, 

 and a rise from this hollow to the interior surface of the shell, indi- 

 cating the effect of alternating pressures (probably tidal) acting, 

 through the mouth of the shell, on the elastic cushion of imprisoned 

 gases, which would have escaped by the spiral, had the shells been 

 rolled over two or three times only by currents. " 



November 19, 1884. 



Prof. T. G. Bonnet, D.Sc, LL.D., F.E.S., President, in the Chair. 



Nicol Brown, Esq., 34 Canonbury Park, IN".; James Charles 

 Chaplin,': Esq., 10 Earl's Court Square, S.W. ; Herbert W. Hughes, 

 Esq., Assoc. K.S.M., Priory Farm House, Dudley ; and Eev. Samuel 

 Pilling, Osborne Terrace, Regent Eoad, Blackpool, were elected 

 Fellows; Professor A. L. 0. Descloizeaux, of Paris, a Foreign 

 Member ; and Professor Hermann Credner, of Leipzig, a Foreign 

 Correspondent of the Society. 



The List of Donations to the Library was read. 



The following communications were read : — 



1. " Note on the Resemblance of the Upper Molar Teeth of an 

 Eocene Mammal {Neoplagiaulax, Lemoine) to those of Tritylodon" 

 By Sir Richard Owen, K.C.B., F.R.S., F.G.S. 



I 



