xvl INTRODUCTION. 
Sussex, usually referred to as ‘ Tilgate Forest.’ Dr. Gideon 
A. Mantell, F.R.S., the discoverer of Zewanodon and Hyleo- 
saurus, Mr. G. B. Hoimes, of Horsham, and Mr. S. H. 
Beckles, F.R.S., of St. Leonard’s, obtained most of the 
Reptilian fossils described in the early memoirs of Mantell,. 
Melville, and Owen, while Major Lambert Brickenden 
also added a few noteworthy specimens. The Mantellian 
Collection was purchased by the British Museum in 1838. 
and 1853; that of the late Mr. Holmes has recently been 
acquired by the Brighton Muscum; and that of Mr. Beckles. 
is still at the residence of its founder at St. Leonard’s. The 
Rev. William Fox, of Brixton, collected numerous remains 
of Dinosaurs from the Wealden cliffs on the south coast of 
the Isle of Wight, discovering the fine examples of Ornzth- 
opsis, Polacanthus, Hypsilophodon, and other genera now 
in the British Museum; while Mr. J. W. Hulke, F.R.S., 
has obtained an important series of bones from the same 
locality, including the type skeleton of /gwanodon seelyt 
and other specimens described in hisown memoirs. During 
recent years, Mr. Charles Dawson, F.G.S., has greatly 
extended the collection of the British Museum, by adding 
numerous discoveries from Sussex localities, including the 
type specimens of three new species of /euanodon. 
Except in the Potton Bone-bed, which chiefly consists 
of remanié fossils from the Kimeridge Clay, Vertebrata 
of Lower Greensand age are rare in Britain, the only 
unique specimens being the type skeleton of /ewanodon 
mantelliand the group of Dinosaurian bones from Hythe 
(Dinodocus mackesont), discovered by Mr. H. B. Mackeson, 
F.G.S., and presented by him to the British Museum. The 
Upper Cretaceous formations, however, have proved more 
prolific, the Cambridge Greensand consisting largely of 
reptilian bones and teeth, and the Gault and various divi- 
sions of the Chalk furnishing numerous specimens both of 
Reptiles and Fishes. The Cambridge Greensand is natur- 
ally best represented in the Weodwardian Museum, Cam- 
