458 Geological Society. 



The author has connected with his paper on the Pterodactyle, 

 some observations on a substance analogous to album-graecum, pro- 

 duced apparently by the Saurian animals, whose remains are de- 

 posited in the lias ; and on a dark colouring matter possessing the 

 properties of Sepia and Indian ink, afforded by a fossil which exhibits 

 a structure like that of the cuttle-fish. He is still engaged in the 

 inquiries connected with these subjects ; and has already obtained 

 some very curious and unexpected results. 



Mr. R. C. Taylor, one of our Fellows, has prepared a valuable 

 list of the fossils hitherto discovered in the British strata*, drawn 

 principally from the works and authority of Mr. Sowerby, to whose 

 indefatigable exertions in extending our acquaintance with the 

 fossils of England Geology is under most essential obligation. The 

 List details the genera in each of its divisions alphabetically; giving 

 for each genus the number of the species most characteristic or 

 abundant in each formation, with the principal localities where they 

 occur. It is not susceptible of abridgement : but some of the results 

 which can be expressed by numbers, have been thrown by the 

 author into Tables, of which the following is a summary :— 



r TTotal number of Species known. 

 Recent. ^ (from Wood's Index Testaceo- 

 [_ logicus) 



Fossil. 



("Total number of Genera , 



.2 r 



Ancient! 

 Strata. 1 



(_ Total number of Species 

 beare. (Species) 



f Carboniferous Order, of Cony-" 

 ! beare. 



Carboniferous beds, to Lias. (Species) 



More 



recent 



Strata. 



[ Ancient strata, to Lias inclusive. 

 *- Total of Species 



Inferior Oolite, to Chalk inclusive. ' 

 (Species) [ 



Strata above the CAatt. (Species). 



Hg 



1961 

 58 



401 



From the Lias to the most recent 7 

 beds. Total of Species J 



134 

 139 



147 



147 



2893 

 135 



1265 



140 



97 



It appears therefore, that the total number of known existing 

 species being about 3000, the number of fossil species is about 1300. 



* Now published in Loudon's Magazine of Natural History, for March 

 1829, Vol. II. p. 26, &c. 



And 



