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III. 



A LIST OF THE LAND AND FKESHWATER MOLLUSKS 



OF lEELAND. 



By ARTHUR WILSON STELFOX, A.R.I.B.A. 



(BEING THE NINTH REPORT FROM THE FAUNA AND FLORA COMMITTEE.) 

 COMMUNICATED BY R. F. SCHARFF, PH.D., M.R.I.A. 



Plate VII. 



Read Decemeek 12, 1910. Published March 4, 1911. 



CONTENTS : 



1. Introduction, 65 



2. List of Species with Distribution, . 7 1 



3. Erroneous and doubtful Records, . 127 



4. Introduced Species, . . . .131 



5. Bibliography, 136 



6. Index, 158 



I. Introduction. 



The first work of any importance published on the Land and Freshwater 

 Molhisca of Ireland was that of Capt. Brown [31],' who, in his Irish Testacea, 

 recorded fifty-six species. Of these fifty-six, nine have now been omitted 

 from the Irish list for various reasons. 



In William Thompson's report [280], which is still our most valuable work 

 on the subject, ninety-nine species are to be found ; and if we add his Helix 

 pulchella var. crenella, to which we now give specific rank, his list includes an 

 even hundred. Unfortunately seven of these must be put down as erroneous 

 records, not through any fault of Thompson's, but owing to the carelessness 

 of a few of his correspondents. 



From the death of Thompson in 1851 until the advent of Dr. Scharff no 

 serious work was attempted in this branch of natural history in Ireland, 

 except that for which the late Prof. Ralph Tate was responsible during his 

 only too short residence in Belfast, and the commencement of a verified 

 census by Messrs. Taylor and Roebuck on the lines of that of the Conchological 

 Society [278]. 



In the year in which the Irish Naturalist first made its appearance (1892) 

 Dr. Scharff gave us a valuable annotated list [214], embodying not only the 



' The numbers in brackets refer to the bibliography at the end of the paper. 

 E.I.A. PROC, VOL. XXIX., SECT. B. \_K\ 



