VI PREFACE. 



greater extent than might be desirable to those who studied the shells alone ; he therefore reserved 

 the figures and descriptions of the Animals for a separate treatise, which will appear uniform with 

 the present Work. This arrangement, it is hoped, will prove more satisfactory to both parties. 

 He has, however, given two plates of Land and Fresh Water Mollusca the size of life. The 

 representations of the interesting genus Limax, are copied from beautiful and correct drawings 

 kindly furnished by the Rev. B. J. Clarke, of Tuam, Ireland, who has lately bestowed much 

 attention on, and ably investigated the Limacidse of his native country. 



Authors have admitted into the British Catalogue, species which are not indigenous ; these 

 have been omitted, but such as appeared in the First Edition of this work have been allowed to 

 remain on the plates, the names only being given without descriptions. 



Every shell, as far as possible, has been drawn from Nature, and generally from the largest 

 and most beautiful specimens which the Author could meet with. But some of the smaller 

 species, whose existence rests on the authority of Walker and Adams, he has been obliged to 

 copy from their works, and therefore does not hold himself responsible for their accuracy. 



In recording the names of those to whom the Author is indebted for aid in the following 

 Work, he must particularly notice those of his late lamented friends Dr. Leach, formerly Chief 

 Zoologist in the British Museum, and General Richard Bingham, of Melcombe, Dorsetshire. The 

 first of these, with that noble liberality for which he was prominently distinguished, — although 

 engaged with a similar work at the time the Author was preparing his First Edition, — threw open 

 his treasures for his use, and otherwise aided him as far as possible in his investigations. To the 

 latter the British Conchologist, and himself in particular, are deeply indebted for the discovery of 

 many new minute species. He spared neither trouble nor expense in following up this branch of 

 Natural History. It will also be seen how much his valued and early friend Stewart Ker, Esq., 

 has added to the Mollusks of the Clyde, and he must also cordially acknowledge his obligations to 

 his friends James Smith, Esq., of Jordan Hill, near Glasgow ; Professor Forbes, King's College, 

 London ; James Gerard, Esq., Edinburgh ; Sir Oswald Mosley, Bart. ; W. C. Trevelyan, Esq., 

 of Nettlecombe Abbey; Thomas Glover, Esq., of Smedley Hill, Manchester; William Nicol, 

 Esq., Edinburgh ; William Bean, Esq., Scarborough ; Lieutenant William Beaumont, R. N., 

 for specimens of Lymnsea involuta ; and to Miss Thomson, of Kendal : and for information on 

 Irish Conchology, to his old friend and fellow-labourer in Conchology M. J. O'Kelly, Esq., 

 Rochestown House, County of Dublin; Robert Ball, Esq., and Miss Mary Ball, Dublin; 

 Thomas William Warren, Esq., of Dublin, who possesses the best collection of indigenous shells 

 in Ireland; and to Dr. Mc. Gee, of Belfast. 



