98 CATALOGUE OF THE MOLLUSCA 
printed in Raine’s “History of North Durham.” Here also one 
or two species appear to have been included by mistake, but, 
upon the whole, it is a pretty correct enumeration of the princi- 
pal shells found on that part of the coast. A “Catalogue of the 
Land and Fresh-water Mollusca of the vicinity of Newcastle,” by 
the writer of this notice, was published in our “ Natural History 
Society’s Transactions” in 1830, to which a Supplement was 
added in 1838. More recently, the contributions of Mr. William 
King, late curator of the Newcastle Museum, and of Mr. Richard 
Howse, to the “ Annals of Natural History” have illustrated several 
of our rarer species. The excellent papers of Dr. Johnston on 
the Mollusca of Berwick Bay, published in the “Berwickshire 
Club Proceedings,” may also be mentioned as coming’ partially 
within the limits of this Catalogue. 
So much having already appeared in this department, it may 
be supposed that little remains to be done in order to give a 
complete list of the Mollusca of the two counties. It will be 
observed, however, that scarcely any notices of the naked or 
shell-less Mollusca have been included in these contributions, 
and that in the lists of shells, the minute and less conspicuous 
kinds, which form a considerable portion of the whole, have been 
generally overlooked. We have been anxious, too, rather to give 
the result of our own observations, and to verify by personal 
observation the species already published, than to make a com- 
pilation from old materials, did these contain a greater propor- 
tion of our Molluscan Fauna than they really do. The attention 
that we have paid for several years to the productions of this 
coast, together with the kind assistance of our friends, has en- 
abled us to add largely to the materials already published. 
The arrangement here adopted is that of Cuvier ; but so much 
has been done since his time, especially towards the attainment 
of a knowledge of the animal inhabitants of shells, upon which 
any arrangements claiming to be natural must necessarily be 
based, that we have been obliged to make several modifications 
to meet the requirements of modern science. We are fully aware 
of the imperfections of many parts of this arrangement as it now 
stands, but we prefer, in the present transition state of the 
