MEMOIRS 



or THE 



GEOLOGICAL SURYEY 



OF 



THE UNITED KINGDOM. 



ILLUSTRATIVE OF 



BRITISH ORGANIC REMAINS. 



DECADE XII. 



ILLUSTRATIONS OF THE STRUCTURE OF THE 

 CROSSOPTERYGIAN GANOIDS, 



BY THOMAS H. HUXLEY, F.RS., 



NATURALIST TO THE GEOLOGICAL SURVEY OF GREAT BRITAIN. 



PUBLISnED BY ORDER OF THE LORDS COMMISSIONERS OF HER MAJESTY S TREASURY. 



LONDON: 



PBINTEB K)U HER MAJESTY'S STATIONERY OFFICE. 



PUBLISHED BY 



LONGMANS, GREEN, READER, AND DYER. 



16295. 



1866. 



