It is well known that an extensive district, commencing near Harwich and occupying nearly all the eastern coast of Suffolk, contains a substratum, several feet in thickness, of the crag-pit shells, which are used in many parts of that district for agricultural purposes. Many of them approach in their specific characters to those shells which are discovered upon our shores; while they are associated with others whose species have ceased to exist. Together with the shells are buried the remains of unknown animals. The Suffolk crag, particularly that in the vicinity of Ipswich, has furnished an extraordinary abundance of fossils to collectors, far exceeding in number those which we are able to present from Bramerton. From Lowestoft to Bramerton, the crag shells are concealed beneath deposits of alluvial gravel, sand, and clay, of considerable but irregular thickness. To the east of Bramerton they have not, I believe, been recognised; to the west they may be observed at Whitlingham, immediately in contact with the chalk; they may also be traced forming thin beds above the chalk on the opposite side of the Yare at Thorpe, and are not unfrequently met with, several feet below the surface, on sinking wells in the city of Norwich. To the west of Norwich I have not hitherto discovered them, but to the north they may occasionally be observed at a few intermediate points between that city and Cromer. The valley of Wroxham, like that of Norwich, is sufficiently deep to intersect the crag, and to