74 Geological Society. 



in Bed No. 1, it is very probable that the Hunstanton Rock is a 

 more typical example of the Upper Greensand than is seen at Cam- 

 bridge, and may represent also those periods which separate that 

 formation from other divisions of the Cretaceous system. 



April 27. — W. J. Hamilton, Esq., President, in the Chair. 



The following communications were read : — 



1. " On the Geology of Arisaig, Nova Scotia." By the Rev. D. 

 Honeyman, F.G.S. 



A careful examination of the country in the neighbourhood of 

 Arisaig enabled the author to construct three sections and a map 

 showing the geological constitution of the district. Two of these 

 sections were nearly parallel to one another, running from N. to S., 

 and taken some distance apart, while the third was nearly at right 

 angles to the other two ; thus a tolerably accurate idea of the 

 geology of the country could be obtained. The author described 

 each of these sections in detail, giving lists of the fossils found in the 

 different beds, which proved them to be of Upper Silurian age ; and 

 he further considered that they justified the adoption for the sub- 

 divisions of these Nova-Scotian Silurians of the terms May-hill, 

 Lower Ludlow, Aymestry, and Tilestones, the first and third of 

 which had been used for them previously by Mr. Salter. Besides 

 Silurian rocks, there occurs in the western part of this district a 

 conglomerate of Low r er Carboniferous age, while trap-rocks occur on 

 the north and south. 



2. " On some Remains of Fishes from the '' Upper Limestone ' of 

 the Permian Series of Durham." By J. W. Kirkby, Esq. 



The object of this paper was to record the discovery of Fish- 

 remains in the upper Magnesian Limestone of the Permian forma- 

 tion, which is higher in that series than any vertebrate remains had 

 been previously known to occur. The strata exposed in the quarries 

 were described in detail, especially the bed from which most of the 

 Fishes were obtained, and which is known as the "flexible limestone." 



The author stated that at least nine- tenths of the specimens 

 belong to Palceoniscus varians, the remainder belonging to two or 

 three species of the same genus, and to a species of Acrolepis. 

 Detailed descriptions of the different species of Fishes were given, as 

 also were short notices of the species of Plants sometimes found 

 associated with them, one of which he believed to be Catamites 

 arenaceus, a Triassic species. The occurrence of Palceonisci with 

 smooth scales w r as stated to be antagonistic to Agassiz's conclusion 

 that the Permian species of that genus have striated, and the Coal- 

 measure species smooth scales. In conclusion Mr. Kirkby re- 

 marked that the fauna of the period appeared to have an Estuarine 

 facies, and he expressed his opinion that the Fishes were imbedded 

 suddenly, as a result of some general catastrophe. 



3. " On the Fossil Corals of the West Indian Islands.— Part 3. 

 Mineral Condition." By P. Martin Duncan, M.B. Lond., Sec. G.S. 



The results of the process of fossilization, as seen in the West 

 Indian fossil Corals, being very remarkable, and having much ob- 



