xiv AUTHOR'S PREFACE. 



To the publishers his thanks are due for their liberality 

 in the matter of illustrations, and the readiness with which 

 they have responded to suggestions. 



With regard to minor illustrations the following acknow- 

 ledgments are due : 



To the Palaeontological Society of Great Britain for 

 permission to reproduce three of the illustrations in Sir 

 Richard Owen's great work, British Fossil Reptiles, pub- 

 lished in their yearly volumes, viz. Figs. 3, 4, and 8. 



To Messrs. Bell and Co. for the following cuts from the 

 late Dr. Gideon A. Mantell's works: viz. Figs. 12, 14, 

 20, 33, 37, 38. 



To Messrs. A. and C. Black for the following cuts from 

 Owen's Paleontology : viz. Figs. 51, 54, 56, 57. 



Appendix IV. contains a list of some of the works of 

 which the writer has made use ; but it would be impossible 

 within reasonable limits to enumerate all the separate 

 papers which have necessarily been consulted. The reader 

 will find numerous references, such as " Case Y on Plan," 

 in brackets ; these refer to the plan given at the end of 

 the excellent little Guide to the Exhibition Galleries in the 

 Department of Geology and Paleontology in the Natural 

 History Museum, Cromwell Road (price one shilling), which 

 visitors to the Museum are advised to obtain. 



