328 Reporh cf- Proceedings — Geological Society of London. 



2. " The Internal Structure of Tipper Silurian Rugose Corals from 

 theGrindrodCollection, Oxford Museum." Bv Donald Esmelnnes, B.A. 

 (Communicated by Professor W. J. Sollas, Sc.D., F.E.S., E.G.S.) 



In this paper the foUowinji; genera and species are described : — 



PalcBOcyclus i^orpita, P. fletcheri, P. rugosus. 

 Cystiphyllum sihiriense, G. cylindricum. 

 Cyathophylhim (?) : a new species. 

 CyatJiophyllum artictilatum, C. truncatum. 

 Strombodes murchisoni, Sir. typus, Str. diffluens. 



The now species of Cj/athophyllum (?) is of especial interest. It was 

 figured by Milne Edwards & Haime as Cystiphyllum cylindricum, 

 Lonsdale, with which it has no close affinities. It combines 

 characters of the Silurian Cyathophylla and SallicR with those of the 

 Lower Carboniferous Caninia. 



Particular attention is paid to the construction of a septum in the 

 various genera, the following types being well represented: — 



(1) Kadial spines on the vesicles, with their bases often connected by a web. 



Example: Cystiphyllum. 



(2) Eods placed in juxtaposition and cemented together. Example : 



PalcEocyclus. 



(3) Simple plates. Example : Cyathopihyllum articulatum. 



(4) Crumpled plates. Example: Cj/^^/iop^jt/ZZmjh (?), the new species. 



(5) 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 

 ilicheli7ii(e, while Strombodes is allied in structure to Cyathophyllum 

 regiiim of the Visean. 



(ii) June 11,1913. — Dr. Aubrey Strahan, F.R.S., President, in the Chair. 



The following communications were read : — 



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

 Salfeld, University of Gottingen. (Communicated by S. S. 

 Buckman, E.G.S.) 



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 Swindon 

 and Westbury, witli an incidental reference to Market Rasen. 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 = u])per part of the English 

 Corallian (-(-Kimmeridge Clay locally) is divided into three zones, 

 found at Osmingtoii, 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 ; 



