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V.—A Catalogue of the Mollusca of Northumberland and 
Durham. By Josuvua ALDER. 
[The preparation of this Catalogue was entrusted to a 
Sub-committee of the Club, consisting of JosepH Harrison 
Fryer, Anpany Hancock, and Josuua ALpER, and has been 
drawn up by the latter with the assistance of the two former. 
The names of the Sub-committee are indicated in the Catalogue 
by their initials. | 
SzvERAL partial notices of the Mollusca, or, to speak more cor- 
rectly, of the Shells of Northumberland and Durham, have from 
time to time appeared. The earliest is that of Wallis in the 
“Natural History and Antiquities of Northumberland,” published 
in 1769. This work contains an account of 45 species and va- 
rieties, rather vaguely designated, after the fashion of the older 
naturalists, but most of which can be easily recognised. They 
consist principally of the most common and conspicuous species. 
No further contributions to the conchology of these counties 
appeared till 1816, when Sir Cuthbert Sharp published in his 
“History of Hartlepool,” a pretty extensive list of the shells of 
that locality. This list appears to have been very carefully 
drawn up according to the best information of the time, but a 
few species have inadvertently been admitted into it, such as 
Venus chione, Cardiwm aculeatum, Buccinum lineatum, and 
Strombus costatus, which are certainly not inhabitants of our 
coast, and must either have come there by chance, or, what is 
more probable, other species somewhat similar in appearance 
have been taken for them. Several species in addition to 
Sir Cuthbert Sharp’s list were given by Mr. Hogg, in his 
“Natural History of the Vicinity of Stockton.” In 1822, 
Mr. Winch published a Catalogue of the Shells found at 
Lindisfarne, in the “Annals of Philosophy”; stated to be 
principally furnished by a lady. It was afterwards re- 
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