218 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 22, 



Postscript. — The * Palaeontological Memoirs ' of Dr. Falconer, pub- 

 lished a few days after the reading of this Essay before the Society 

 (Jan. 8, 1868), contain notes on Rhinoceros Etruscus, and many 

 beautiful plates of jaws and teeth for the most part from Italy 

 (vol. ii. p. 354-368, pis. 25-29). With the sole exception of the 

 terminology being different, Dr. Falconer's definition of the species is 

 identical with my own. In the same work also there are Essays 

 on the three other species of Uhinoceros found in Great Britain, 

 which (if the name R. antiquitatis, Blum., be substituted for R. 

 tichorJiinus, Cuvier, R. Tiemitoechus, Falc, for R. leptorhinus, Owen, 

 and R. leptorhinus, Cuvier, for R. megarhiniis, De Christol) differ but 

 very slightly from those which form the series of which the memoir 

 on R. Etruscus is the conclusion. The difference is merely one of 

 names ; and the conclusions arrived at independently of each other 

 are identical.— W. B. D., Feb. 29, 1868. 



January 22, 1868. 



James Trubshaw Johnson, Esq., Mining and Civil Engineer, 

 Lichfield, Staffordshire, and Stephen Brown Dixon, Jun., Esq., 

 Pewsey, Wilts, were elected Fellows. 



The following communications were read : — 



1. On the Speeton Clay. By John W. Judd, Esq., F.G.S., of the 

 Geological Survey of England and Wales. 



Contexts. 

 I. Introduction. 

 II. Bibliography of the subject. 

 III. General desci'iption of the Coa.st-section at Speeton. 

 IV. Is the Speeton Clay the equivalent of the Gaalt ? 

 Y. Classification of the beds constituting the Speeton Clay. 



A. Upper Neocomian. 



B. Middle Neocomian. 



C. Lower Neocomian. 



D. Portlandian. 



E. Up]3er Kirameridge. 



F. Middle Kimmeridge. 



G. Lower Kimmeridge. 

 VI. Conclusion. 



Appendix A. Table showing the vertical distribution of the fossils of the 

 Speeton Clay. 

 ,, B. Notes on the distribution of some of the Speeton-Clay fossils. 



„ C. On the economic products of the Speeton Clay. 



I. Introduction. 

 In the attempt to study the Neocomian formation as developed 

 in this country, my attention has been directed for some years past 

 to the series of beds in Yorkshire which since 1829 has been known as 

 '*the Speeton Clay." I have found that, although a very great variety 

 of opinions had been expressed concerning the age of this formation, 

 but little had been done towards working out in detail the true 



