74? PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DeC. 2, 



The collections sent from Euboea and the neighbouring mainland 

 are of great interest. 



The specimens in the freshwater limestone of Oripo are undoubt- 

 edly Lymneus longiscatus and a Paludina, both characteristic of the 

 Smyrna freshwater tertiaries, and indicating an eocene epoch. 



But those from Koumi have a much more recent aspect. In the 

 strata there we find a Planorbis, which is most probably the existing 

 P. orientalis ; a Paludina, nearest an existing Greek species ; also a 

 Cyclas, very near one which I found in Asia Minor. With these are 

 numerous and beautifully preserved remains of plants, leaves of a 

 Beech, two species of Oak, a Laurus, a Salix?, a Celtis?, an Oleander, 

 and leaves and fruit of Pine. 



The fish, now in the collection of Sir Philip Egerton, have been 

 examined by Prof. Agassiz, and pronounced undescribed. 



I infer that the Koumi tertiaries belong to a more recent epoch 

 than those of Oripo and Smyrna. 



DESCRIPTION OF THE PLATES TO LIEUT. SPRATT'S PAPERS ON 

 SAMOS AND EUBCEA. 



Plate II. 

 Geographical map of a portion of the Greek Archipelago, to show the relative 

 position of Samos, Euboea and Smyrna. 



Plate III. 

 Geological map of a portion of the island of Samos. 



Plate IV. 

 Geological map of a portion of the islands of Euboea and Boeotia. 



December 2, 1846. 



The Right Hon. Sir E. Ryan, W. Bainbridge, Esq., G. E. Dennes, 

 Esq., and J. B. Birch, Esq., were elected Fellows of the Society. 



The following communication was read: — 



On Slaty Cleavage. By Daniel Sharpe, Esq., F.G.S. 



Introduction. 



During the last few years the subject of slaty cleavage has gradually 

 attracted the attention of geologists, and much valuable information 

 regarding it has been accumulated. Professor Sedgwick's clear 

 description of the leading phaenomena connected with cleavage*, 

 led geologists into the right path, and since the publication of his 

 views in 1835 we rarely meet with those unintelligible descriptions, 

 so common in the earlier writers, in which the cleavage and the 

 stratification are confounded together in hopeless confusion. Sub- 

 sequent observers have added materially to our knowledge, and 

 various remarks illustrating the subject will be found scattered 



* On the Structure of large Mineral Masses, &c. Trans, of Geol. Soc. 2nd 

 Series, vol. iii. p. 469, &c., read March, 1835. 



