554 Geological Society : — 



trasted with the superjacent marine Zechstein, and also because the 

 geographical term Permian, involving no theory, had previously 

 been widely adopted, and even used by Geinitz himself. 



Sir Roderick having expressed his great obligations to Dr. Geinitz, 

 to whose excellent work (' Dyas ') he made many references, and to 

 the name of which only he objected, concluded by presenting to the 

 Society a very large collection of rock specimens of the Lower Per- 

 mian of Saxony. 



March 18. — John Carrick Moore, Esq., F.G.S., in the Chair. 



The following communications were read : — 



1. "On the Correlation of the several Subdivisions of the In- 

 ferior Oolite of the Middle and South of England." By Harvey B. 

 Roll, M.D., F.G.S. 



The order of succession of the subdivisions of the Inferior Oolite 

 observed in passing from the southern side of the Mendips to the 

 typical section of that formation at Leckhampton, with the litholo- 

 gical characters of the strata, were described in this paper. The 

 classification of the members of the Inferior Oolite employed by Mr. 

 Hull in the Memoirs of the Geological Survey was adopted by the 

 author ; and it was shown that in proceeding from Bath northwards 

 the two upper subdivisions may be seen to rise, the Building Free- 

 stone at the same time becoming thicker, while at Aveling the 

 Oolite Marl is first seen interposed between the Lower Ragstone 

 and the Lower Freestone, and at Nailsworth the former is separated 

 from the Oolite Marl by the Upper Freestone, all these beds becoming 

 thicker towards Cheltenham, and thinner in the opposite direction, 

 towards Bath. Dr. Holl concluded with some remarks on the strata 

 exhibited in the Rolling Bank Quarry, and on the geographical dis- 

 tribution in England of the members of the Inferior Oolite. 



2. " On the occurrence of large quantities of Drifted Wood in 

 the Oxford Clay, near Peterborough." By Henry Porter, M.D., 

 F.G.S. 



The Oxford Clay in the neighbourhood of Peterborough having 

 been exposed in clay-pits, the author was enabled to carry on some 

 investigations regarding the fossils which there occur in it ; he 

 found the formation to be extremely rich in organic remains, and, 

 besides containing many species of Ammonites and other Mollusca, 

 which he enumerated, to include large quantities of drifted wood, 

 the fragments bearing on their surface the impressions of Am- 

 monites. 



3. " On a new Macrurous Crustacean from the Lias of Lyme 

 Regis." By Henry Woodward, Esq., F.Z.S. Communicated by 

 Prof. Morris, F.G.S. 



A very perfect specimen of a Crustacean, obtained from the Lias 

 of Lyme Regis by Mr. Harrison of Charmouth, was described in 

 this paper as the type of a new genus. The nearest living analogues 

 were stated to belong to the fossorial group Thalassinida, from which 

 it differs chiefly in its much less rudimentary abdomen, and the 

 length of its chelae. Amongst fossil forms, this Crustacean, which 



