MEMOIRS 



OF THE 



GEOLOGICAL STJEYEY 



THE UNITED KINGDOM. 



ILLUSTRATIVE OF 



BRITISH ORGANIC REMAINS, 



DECADE XII. 



ILLUSTRATIONS OF THE STRUCTURE OF THE 

 CROSSOPTERYGIAN GANOIDS, 



BY THOMAS H. HUXLEY, F.R.S., 



NATURALIST TO THE GEOLOGICAL SURVEY OF GREAT BRITAIN. 



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



LONDON: 



PRINTED PGR HER MAJESTY'S STATIONERY OFPICE : . 



PUBLISHED BY 



LONGMANS, GREEN, READER, AND DYER. 



1860. 



Price 2s. 6d. 



