4 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 Avhole, 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, npon 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 



