PREFACE, 
THE recent removal of the Geological Collections from the over- 
crowded apartments of the British Museum in Bloomsbury to the 
new and spacious galleries of the present building, has afforded 
ample convenience to the scientific staff of the Department to 
carefully examine and re-arrange the entire Collection—a work 
upon which they are still engaged, and one that must necessarily 
occupy many years to complete. 
One result of the re-arrangement has been to bring into greater 
prominence the need, long felt, of a series of Descriptive Catalogues 
of each class of Fossil Remains, suited to the wants of the scientific 
worker, in the same manner that it is hoped the Guide-books 
satisfy the requirements of the ordinary visitor. 
The present volume, which has been most carefully prepared by 
Mr. R. Lydekker, forms Part I. of a series intended to embrace the 
whole of the Fossil Vertebrata. 
Catalogues of other Classes have been already printed or are 
now in course of preparation; and it is confidently hoped that, 
before many years have elapsed, similar records of the entire 
Geological Collection will have been published. 
HENRY WOODWARD. 
British Museum 
(Natural History), 
Department of Geology, 
January 1, 1885. 
Eee ee ee 
EEO 
