INTRODUCTION. XVI 
bridge ;* but there are numerous fine fragments also in the 
British Museum, Museum of Practical Geology, York 
Museum, and the private cabinet of Mr. Thomas Jesson, 
F.G.S., of Northampton ; and few collections of importance 
are destitute of a typical series of specimens. The Verte- 
brate fossils of the Gault are more satisfactorily preserved 
than those of the Cambridge Greensand, and are represented 
in the British Museum, Museum of Practical Geology, and 
the Woodwardian Museum, to which they have been chiefly 
supplied, either directly or indirectly, by the experienced 
collector, Mr. John Griffiths, of Folkestone. Chali fossils 
are seen in most Museums, and the Fishes usually occur 
in an exquisite state of preservation. The late Dr. Gideon 
A. Mantell, F.R.S., as in the case of the Wealden Verte- 
brata, was a pioneer in the collection of those of the 
Chalk of Sussex ; and the numerous fine examples of his 
patient work of extrication now in the British Museum are 
described and figured both by Agassiz and by himself. Mr. 
Frederic Dixon, of Worthing, author of the well-known 
Geology and Fossils of Sussex,t the late Dr. J. S. Bower- 
bank, F.R.S., and Mrs. Smith, of Tunbridge Wells, also 
obtained the type specimens of many of the species of 
Fossil Fishes and Reptiles discovered in the Chalk of 
Sussex, Kent, and Surrey, at present, with rare exceptions, 
preserved in the British Museum; and for a long period 
Mr. Henry Willett, F.G.S., of Brighton, has been engaged 
in collecting the unrivalled series of Chalk fossils, now 
presented to the Brighton Museum. In more recent 
* H. G. Seeley, /udex to the Fossil Remains 07 Aves, Ornitho- 
sauria,and Reptilia... . in the Woodwardian Museum, 1869 ; also 
Ornithosauria, 1870. 
+ This work is dated 1850, but was not published until after the 
author’s death, and, according to Morris and Mr. William Davies 
(zw ditt.), was not issued before 1852. 
t In the first edition of Dixon’s Geology of Sussex, and in some 
of the memoirs of Owen and Egerton, Mr. Willett is referred to 
under his earlier surname of Catt. 
