70 Proceedings of the Roj/al Irish Academ//. 



central districts ; and Mr. J. N. Milne's notes on the counties of Donegal, 

 Derry, and Tyrone have proved most valuable. To the English conchologists 

 who have often spent their holidays in this country, helping us to explore 

 some unworked areas, we also owe a great deal, but particularly to the late 

 Dr. G. W. Chaster, Messrs. L. E. Adams, E. Collier, E. Standen, and 

 C. E. Wright ; while great assistance has been given to the Irish wbrr?;ers'''by the 

 Eev. E. W. Bowell, Messrs. A. S. Kennard, C. Oldham, W. Deiii^oii" Eo'ebuck, 

 J. W. Taylor, and B. B. Woodward, in identifying some. of the niore critical 

 species. The following naturalists, while irot' confining "themselves to cOh- 

 chology, have also considerably added to our material : — Miss A. L. Massy, 

 Miss Amy Warren, Eev. A. and Miss Delap, Messrs. Harry Fogerty, 

 G. P. Earran, W. A. Green, J. Eay Hardy, W. E. de V. Kane, B. E. Lucas,' 

 H. Wallis Kew, J. G. Milne, H. L. Orr, E. LI. Praeger, J. E. le B. Tonilin, 

 Major Trevelyan, the late A. G. Moi-e and S. A. Stewart, and many others. 



In addition to the collections of many conchologists, that in the National 

 Museum — including Dr. Scharfi's private collection — and those of Thompson 

 and Hyndman in Belfast, have been looked through. 



The nomenclature in the paper is founded on that of the Cohchologieal 

 Society's List ; but I have followed Mr. J. W. Taylor in retaining the old 

 name Hyalinia instead of Vitrea. In a few other cases I have departed froui 

 the Society's nomenclature for reasons stated in the text. 



The synonyms given are those used in the principal Irish lists, viz., those 

 of Brown, Thompson,' and Scharff ; but where more than one of these writers 

 employ the same name, I have given only the earlier reference. 



Many recoi'ds for such shells as Vertigo inisilla and V. angtistior are based 

 on specimens found in sand-dune deposits; but, as the- chief object of a 

 census is as an aid to the study of geographical distribution, I consider it' 

 quite justifiable to include these records. 



The only records of Pisidia included in section 2 of the paper are those 

 founded on specimens verified Ijy Mr. B. B. Woodward, who has made a 

 special study of this genus, except those of Pisidnim amniciim, P. hensloiv- 

 anum, and P. milium, in which cases there is little likelihood of mis- 

 takes having been made. Tlrerefoi'e, although the common species, such as 

 P.pusilhim, P. jpersoitatmn, P. casertanum, and P. subtruncatuin, are known to 

 be generally distributed, we have only a few verified records. All records, 

 other than those verified by Mr. Woodward, are included among the doubtful 

 records in the third section of the paper. 



' I must here state that the paging given in tlie case of Thompson's work is that of the reprint 

 and not of the original. 



