Geological Society. 



twelve of which belong to the placoid order, one is a ganoid, and one 

 a cycloid fish. Among them is Cor ax pristodontus, identical with 

 the Maestricht species. From the evidence afforded by the exami- 

 nation of these fishes. Sir Philip Egerton takes the same view of the 

 age of the beds which was inferred by Prof. E. Forbes from the in- 

 vertebrate remains (p. 217), considering them as belonging to the cre- 

 taceous sera, though he is inclined to place them higher in the series. 



4. "On the occurrence of a Bed of Septaria containing Fresh- 

 water Shells, in the series of the Plastic Clay at New Cross, Kent." 

 By H. Warburton, Esq., M.P., F.R.S., Pres. G.S. 



The bed described does not form a continuous stratum, but occurs 

 ■with interruptions and intervals in the condition of Septaria, which 

 contain remains of shells of the genera Paludina and Unto. A sec- 

 tion of the locality, showing the position of the bed, was made by 

 Mr. Simms. In France similar associations of freshwater remains 

 have been noticed in the plastic clay series by M. D'Archiac. 



May 1 . — The following papers were read : — 



1. " Report on the Fossils from S. Fe de Bogota, in South Ame- 

 rica, presented to the Society by Mr. E. Hopkins." By the Curator. 



These fossils belong to seventeen species of Mollusca, of which 

 nine are identical with species from the same locality, described by 

 Von Buch, D'Orbigny, and Lea. They are from a dark compact 

 limestone, which the reporter regards as a member of the lower part 

 of the cretaceous system. Eight of the species are new. 



2. " Comparative Remarks on the Sections of the Strata below the 

 Chalk, on the Coast near Hythe in Kent, and Atherfield, in the Isle 

 of Wight." By Dr. Fitton. 



In this paper the author enters into an elaborate review of the 

 state of our knowledge of the lower greensand in England, and 

 compares the several deposits and their fossil contents. After com- 

 menting on the relations of that formation at Hythe, with the several 

 strata of the Atherfield section, and showing the comparative state 

 of our knowledge of them when he read his memoir on the sub-cre- 

 taceous strata in 1824, with the state of the subject at the present 

 day, he proceeds to examine the researches of M. Montmoulin in 

 Switzerland, M. Dubois de Montperreaux in the Caucasus, MM. 

 Leymerie and D'Orbigny in France, and M. Roemer in Germany, 

 and to prove the identity of the beds styled by some of those authors 

 Neocomian with his lower greensand. Regarding both names as 

 objectionable, the former on account of its being derived from a lo- 

 cality which will not serve as a type for the formation, and the latter 

 because it implies erroneous relations, he proposes the term " Vec- 

 tine," from the island in which we find the strata of this part of the 

 cretaceous system best displayed. 



3. A letter from Mr. Simms was read, noticing the occurrence of 

 Lower Greensand clays resting on the Wealden at the cutting near 

 Jeston turnpike, on the Maidstone line of railway. 



4. " On the Section of the Lower Greensand, between Black Gang 

 Chine and Atherfield Point." By Capt. Boscawen Ibbetson and Prof. 

 E. Forbes. 



After describing sixty-three distinct strata, presenting a total 



