﻿148 Geological Society : — 



Crag was hopeless, mainly from the difficulty of recognizing ex- 

 traneous fossils. He expressed his disappointment at the fish-fauna 

 of the Red Crag not having been noticed by the author. The 

 teeth which were common to the Eocene and Red Crag had usually 

 some phosphatic matter adherent. Those, on the contrary, which 

 only occur in the Crag, have never any phosphatic matter attached. 

 He therefore regarded the former class as derivative, but the latter 

 as belonging to the deposit in which they occur. 



Mr. Searles Wood, Jun., denied that the Red Crag was the 

 one homogeneous deposit divided into two beds represented by 

 Mr. Prestwich; he protested against the Walton and Butley de- 

 posits being regarded as one and the same — the former bearing more 

 affinity to the Coralline Crag, and being therefore probably the older. 



Mr. Prestwich, in reply, explained that he did not intend to 

 omit the lists of mammalian remains of the Red Crag, Tables of which 

 were appended to the paper, the greater part of them, however, 

 he regarded as derivative. With regard to the relation of the 

 Chillesford beds to the Forest-bed, he had never seen a section in 

 which the latter underlay the former ; the Chillesford beds at 

 Easton Bavent were underlain by sandy beds referable to the Nor- 

 wich Crag. He considered that some division in the lower bed, as 

 suggested by Mr. Searles Wood, was to be found. 



June 3rd, 1868.-— Prof. T. H. Huxley, LL.D., F.R.S., &c, President, 

 in the Chair. 

 The following communications were read : — 



1. " On some Genera of Carboniferous Corals." By James Thom- 

 son, Esq. 



Mr. Thomson gave a resume of the diagnostic peculiarities of 

 Cyathophyllum, Goldfuss, Clisiophyllum, Dana, Aulophyllum, Milne- 

 Edwards and Jules Haime, and Cyclophyllum, Duncan and Thom- 

 son. The author then noticed that the separation of these genera 

 was inevitable and necessary, from the ordinary rules of the classi- 

 fication of the Zoantharia. He concluded by remarking upon the 

 evident structural distinctions between Clisiophyllum, Aulophyllum, 

 and Cyclophyllum. 



Dr. Duncan said that the existence of a columella was a generic 

 distinction in recent and mesozoic corals, that the type of the palae- 

 ozoic Cyathophyllidse was reflected in the Lower-Liassic coral-fauna 

 of South Wales and the west of England, and that there was a 

 necessity for the same principles of classification in the palaeozoic 

 and in the recent coral-fauna. There was a gradation from the 

 Rugosa to the Aporosa. 



Prof. Huxley remarked that the structure of the specimens of 

 the different genera proved that there were great difficulties in ac- 

 cepting Agassiz's opinion that these old forms were not Zoantharia. 



2. ' f On the Pebble-beds of Middlesex, Essex, and Herts." By 

 S. V. Wood, Jun., Esq., F.G.S. 



The author described some pebble-beds in the counties of Mid- 

 dlesex, Hertford, and Essex, which, in the MS. memoir deposited 



