PpA: Ralwhk 
CHAPTER I. 
THE CHALK FORMATION. 
Dr. ManTE.L_’s work on the fossils of the South Downs, published 
more than twenty years ago, created much interest, not only in Sussex, 
but in all countries where the chalk formation is a principal feature of 
its geology. Having resided many years in Sussex, and procured 
fossils from the various chalk-pits in the neighbourhood, I found that 
my collection contained many unnoticed specimens; and, with the 
assistance of several geological friends, I am enabled to offer some 
further illustrations of the Cretaceous period. 
I beg to return my grateful thanks to the following distinguished 
cultivators of geological science and collectors of its evidences, from 
whom I have derived information :—The Marquis of Northampton, 
P.R.S.; the Earl of Enniskillen, F.R.S.; Sir Philip Grey Egerton, Bart., 
F.R.S.; Sir Francis Shuckburgh, Bart., F.R.S.; the Rev. J. Austin ; 
the Rev. H. Hoper; Dr. Mantell, F.R.S.; Ed. Forbes, Esq., F.R:S. ; 
J. KE. Gray, Esq., F.R.S.; J. S. Bowerbank, Esq., F.R.S.; N. Wetherell, 
Esq., F.G.S. ; Channing Pearce, Esq., F.G.S. ; W. Flower, Esq., F.G:S. ; 
W. D. Saull, Esq., F.G.S.; Major Boys ; Robert Drewitt, Esq. ; Edward 
Clark, Esq., F.G.S.; W. Harris, Esq., F.G.S.; J. Morris, Esq., F.G.S. ; 
Mr. J. Bass, Jun.; Mr. Tennant, F.G.S.; Captain Burgh; Mr. Salter, 
F.G.8.; Mr. Perdue; Mrs. W. Trower, Weston; and to Mrs. Smith, 
of Tonbridge Wells. 
I have great satisfaction in stating, that Professor Agassiz and Sir 
