INTRODUCTION. 29 



No. 3. Preston, Lancashire, by Messrs. Gilbertson 

 and Kenyon. 



No. 4. Scarborough, Yorkshire, by Mr. Bean. 



No. 5. Derbyshire, by Mr. Bloxam. 



No. 6. Nottinghamshire. 



This is the most complete list next to that of the 



London district The species are only marked 



with the other numbers when they do not occur in 



Mr. Alder's list. 

 The sixth column, those found in Scotland, extracted 



from the notes of Laskey and Dr. Fleming : this is 



very imperfect. 



No. 2. lona, by Mr. Lowe. 



No. 3. Highlands, by Mr. Alder. 



No. 4. Glasgow, by Mr. Alder. 

 The seventh, the species found in Ireland. 



No. 1. Dublin, from Capt. Brown's list. 



No. 2. Belfast, from specimens sent by Mr. Thomp- 

 son and Mr. Hyndeman, to the British Museum 

 collection : this is also very imperfect. 

 The eighth column contains the species enumerated 



in Mr. Forbes's Mollusca Monensia, as inhabiting 



the Isle of Man. 

 The 9th column is left for the collector to fill 



up with the shells of his own district or of any 



other which he may visit. 



The tenth, the species described by Pfeiffer, as inha- 

 biting Germany. 

 The eleventh column are the Swedish species noticed 



by Nilson. 

 The twelfth column, the species mentioned by Phi- 



lippi as found in Sicily, marked 1, and by Payra- 



deau in the island of Corsica, marked 2. 

 c 3 



