244 Mr. S. V. Wood’s Catalogue of Shells from the Crag. 
largely upon the valuable space in your Journal; I have there- 
fore introduced no more synonyma than I found absolutely 
necessary to make it intelligible. References are given where 
the species have been verified, and the new names are merely 
provisional, as they are affixed to specimens in my Cabinet: 
as it is my intention at some future period to give full de- 
scriptions of these, I shall defer my copious remarks till that 
time. Sutton (near Woodbridge in Suffolk) is given as the 
locality to the greater number of species, though many of them 
are not restricted to that parish; but as quarries of the red and 
coralline crag are there numerous and very rich in organic 
remains, a repetition of places is needless; where others are spe- 
cified, they denote the species to have been there more pecu- 
liarly located ; those for the mammaliferous crag I have taken 
from Woodward, with a few additional new discoveries given 
me by Capt. Alexander. The localities for the red and coral- 
line shells I will guarantee, having myself found every species 
enumerated in this catalogue, with the single exception of the 
Cyrena at Gedgrave. The classification is according to La- 
marck, and as it is the best known is best adapted to my 
purpose, the shells having been long thus arranged in my 
cabinet. Upon looking over the catalogue, it will be observed - 
that several of the shells now living in the present seas are 
quoted as found fossil in the coralline crag, while they appear 
to be wanting in the red or newer formation ; but in most of 
the instances the specimens are rare even in that deposit, 
which was formed either in deeper or more tranquil water 
than we have every reason to believe was the case with the 
gravelly covering that in some places rests upon it; but even 
where they are found in numbers their fragility might have 
been unable to withstand the agitation of a littoral deposit ; 
they, of course, must have existed through the more modern 
period. The Tellina donacina, a shell whose solidity we might 
have imagined to have been a sufficient protection, has not 
hitherto been found in the red crag, though one of the most 
abundant in the coralline; yet its presence there is, as far 
as I know, confined to one spot, thus appearing to have been 
a very local species; further search, particularly in newly dis- 
covered localities, will probably bring to light many of these 
desiderata. 
Yours, &c. 
S. V. Woop. 
13, Bernard Street, Russell Square. 
Oct. 15, 1840. 
