G02 Geological Society. 



(b) Rods placed in juxtaposition, and cemented together. Example: 



Palaocych/s. 



(c) Simple plates. Example: Cyathophylhim artieulaium. 



(d) Crumpled plates. Example : CyatTiophyllum (?), the new species. 



(e) Plates with backward costal prolongations. Example : Strombodes. 



Comparison of the Upper Silurian coral facies with that of the 

 Lower Carboniferous shows that Cystiphyllum, in its vesicular and 

 spinose structure, bears a close resemblance to the compound 

 MichelinioB, while Strombodes is allied in structure to Cyathophyttum 

 regium of the Visean. 



June 11th, 1913.— Dr. Aubrey Strahan, F.R.S., President, 

 in the Chair. 



The following communication was read : — 



' Certain Upper Jurassic Strata of England.' By Dr. Hans 

 Salfeld, University of Gottingen. 



The writer has studied the Upper Jurassic strata of North- 

 Western Germany, the Boulonnais, and Southern England, with 

 special reference to the ammonites and their zones. The results 

 of his labours are to be published in detail; but, in anticipation, 

 he offers to the Society an epitome of his conclusions with regard to 

 the English strata. 



The localities with which he deals are the Dorset coast from 

 Kimmeridge to Abbotsbury, and the Wiltshire exposures at Swin- 

 don and Westbury, with an incidental reference to Market Basen. 

 The formations concerned are the Portlandian, Kimmeridgian, 

 and for a starting-point the Upper Oxfordian : these terms 

 being employed in the German sense. The Upper Oxfordian 

 = upper part of the English Corallian (4- Kimmeridge Clay locally) 

 is divided into three zones, found at Osmington, Westbury, and 

 Swindon. The Kimmeridgian is divided into five zones, and is 

 equal mainly to the Lower Kimmeridge Clay of English authors, 

 with one important exception : the Abbotsbury Iron-Ore is placed 

 as the second zone of the Kimmeridgian, and is correlated with the 

 Market-Basen Clays. The Portlandian is divided into nine zones ; 

 but the term as used in the paper includes the Portland Oolites, 

 Portland Sands, and Upper Kimmeridge Clay of British authors. 



Three new genera of ammonites are named, and two new zonal 

 species of ammonites are defined. 



