JOURNAL OF CONCHOLOGY. 45 



THE CONCHOLOGICAL SOCIETY'S LIST OF 

 BRITISH LAND & FRESHWATER MOLLUSCA.— 1883. 



The lapse of time since the publication of Jeffreys' 'British 

 Conchology,' still our standard manual, and the number of 

 forms lately added to the British fauna, has rendered necessary 

 the preparation of a new list. The present one has therefore 

 been drawn up by a committee appointed by the Conchological 

 Society, consisting of Messrs. J. W. Taylor, W. Denison Roebuck 

 and W. Nelson, with the president and secretary, and includes 

 all forms which have so far been authenticated as British. 



Explanations. 



The Arrangement is that of Dr. Jeffreys, the one 

 familiar to British conchologists. 



The Nomenclature is also in the main that of Dr. 

 Jeffreys. It has been carefully examined and minor points 

 revised, but the compilers have not felt themselves justified in 

 making more than slight corrections, as the publication of a 

 list of names is not a fitting occasion on which to introduce 

 radical changes of nomenclature, or confusion would be the 

 inevitable result. 



The Authorities for Specific Names have been care- 

 fully revised, and the practice of enclosing them within 

 parentheses has been adopted in the case of species which were 

 originally described as of a different genus to that now used: 

 e.g., Arion ater (L.) was described as a Limax, while Helix 

 hispida L. retains its original generic allocation. 



Numbers and Letters.— For convenience in exchang- 

 ing, the species included in the list are numbered consecutively 

 throughout, and the varieties of each species are lettered, 

 beginning with b, the type always being considered to be a. 



Square Brackets [ ] are used to denote species whose 

 claim to rank as British is not yet thoroughly established, as in 

 the case of Helix villosa. 



Monstrosities, although of no very great importance, are 

 included in the list, placed after the varieties of each species. 



