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. Wood. 



13, Bernard Street, Russell Square. 

 Oct. 15, 1840. 



