484 Dr. H. Woodward—A Fossil in a Chalk Flint. 
dissimilar from that of its nearest living allies. Furthermore, the 
object he has to deal with has undergone mineralization, more or less 
completely, so that its appearance is greatly altered. But most 
frequently the object placed before him is only a fragment of the hard 
part of some animal which he is nevertheless called upon to identify 
at once. 
Here is a case in point: my friend Mr. W. H. Paterson requested 
me to name a fragmentary fossil embedded in a waterworn flint from 
the Chalk, picked up by Mrs. Paterson some years since on the beach 
at Sherringham, Norfolk. The structure (whatever it might be) 
occupied only a part of the pebble (Fig. 1), and was also partially 
exposed on the reverse side (Fig. 2). It was certainly not related to 
the ordinary forms of inorganic markings known as ‘ banded flints’, 
which frequently occur as flint pebbles on our shores, and were at 
one time believed by Dr. Bowerbank and others to be the remains of 
fossil sponges. My brother, the late Dr. 8. P. Woodward, described 
a number of these in a paper in the Grotogica, Macazine (1864, 
Vol. I, pp. 145-9, Plates VII and VIII). ‘The banded structure in 
IZ = = 
ZEA 
ZZ = 
i -: 
———— 
Inte, Il. Fic. 2. 
Fie. 1, obverse; Fie. 2, reverse side of waterworn flint pebble from the beach at 
Sherringham, Norfolk. In the collection of W. H. Paterson, Esq. 
these flints is certainly due in many cases to deposition (op. cit., 
Pl. VI, Fig. 4), but in other instances the banding, if not caused 
by, 1s accentuated by the introduction within the flints of mineral 
colouring matter, carried in solution by water permeating the flint 
along lines of least resistance; for even flint contains much water 
interstitially within its pores, which escapes by evaporation when 
flints lie exposed upon the surface. Instead of the transverse lines 
seen in ordinary banded flints, the surface of the Sherringham pebble 
displays about fifteen imbricated, scale-like markings upon its front or 
obverse (Fig. 1) side, and two or three additional ones (evidently part 
