16 Mantellian Museum at Lewes. 
it would rather increase the value of the original discovery, 
as we should have two new species of enormous reptiles 
instead of one. 
Among the other bones, in this museum, from ‘Tilgate 
Forest, there are some of one or more species of birds; it 
ought, however, to be remarked that, as the supposed bones 
of sed found in the lias have been discovered to belong to 
a species of flying lizard, it may, therefore, be doubtful w hether 
these bones may not belong to a similar species of reptile. 
Mr. Mantell, whose authority as a physiologist ought to have 
great weight, is, however, inclined to refer these bones from 
Tilgate Forest to birds. 
There are the remains of three species of turtles in the 
Sussex-beds, two of which are supposed to have been fresh- 
water species: the remains of fishes are also numerous; they 
consist chiefly of detached bones, teeth, and scales, no entire 
skeleton has yet been found. 
The fresh-water formation of Sussex and part of Kent may 
properly be named the Sussex-beds; some of them can be 
traced as far as Dorsetshire westward, but no distinct portion 
of them has hitherto been discovered in the midland counties. 
Having recently traversed these beds in various directions, I 
intended to have offered some observations upon them in 
the present paper, but it has already exceeded the length I 
proposed, A very satisfactory description of the strata of 
Tilgate Forest is given in the second volume of Mr. Mantell’s 
Illustrations of the Geology of Sussex, a work which ought 
to be in every public librar y, where natural history is culti- 
vated: the forty-two plates in the first volume, it has already 
been mentioned, were engraved by Mrs. Mantell, without 
whose able cooperation it would have been impossible for 
Mr. Mantell, occupied as he is in the arduous labours of an 
extensive medical practice, to have effected so much for the 
advancement of science. 
Besides the collection of Sussex fossils, this museum con- 
tains many interesting organic remains from various parts of 
the world. Mr. Mantell, with much liberality, allows the 
museum to be seen by the public on the first and third 
Tuesdays of every month, from one till three, application 
having been previously made by letter. 
I am, Sir, yours, &c. 
Hampstead, Sept. 29. 1829. Ro. BAKEWELL. 
P.S. The horn of the Iguanodon (e) is half the na- 
tural size, and can only be regarded as a wart, when 
compared with the size of the animal. The Cypris faba, 
