16 Mr. W. Thompson's Catalogue of the Land and III. — Catalogue of the Land and Freshwater Mollusca of Ire-land. By Wm. Thompson, Vice-President of the Natural History Society of Belfast. On the subject of the Conchology of Ireland, three catalogues were published within a comparatively short period ; Dr. Tur-ton's in July 1816, in the i Dublin Examiner, or Monthly Mis-cellany of Science, Literature and Art ;' Capt. Brown's in the second volume of the Wernerian Memoirs in 1818* ; and in this same year a third appeared in the Appendix to Walsh and Whitelaw's History of Dublin, from the pen of M. J. O'Kelly, Esq. of that city. The species of land and fresh-water Mollusca enumerated in these three catalogues are much the same, and about fifty in number. In the subsequent works of Brown and Turton a few more species were added. To Bryce's c Tables of Simple Minerals, Rocks and Shells/ found in three of the northern counties, published in 1831, Mr. Hyndman contributed two species hitherto unnoticed. In the London and Edinburgh Philosophical Magazine for 1834 (p. 300.), about thirty additional species were made known by myself; in a paper entitled £ Additions to the Fauna of Ireland/ published in the Annals for last March, I noticed a few more ; and in the present communication there are two species previously unrecorded. I shall here, for the sake of brevity, avoid entering into detail respecting any of the spe-cies thus alluded to, but shall correct in its proper place in the following paper, in so far as my information extends, every error, either of others or of my own. The order in which the genera and species appear in Mr. Gray's edition of Turton's i Manual of the Land and Fresh-water Shells of the British Islands/ is adopted. Class 1. GASTEROPODA, Cuv. Order I. Phytophaga. Fam. 1. NeritiduE. Gen. 1. Neritina, Lam. 1. N.fluviatilis, Lam. Gray, Man. p. 83. pi. 10. f. 124. Nerita fluviatilis, Mont. p. 470 ; Drap. p. 31. pi. 1. f. 1 — 4. Is found in the east, west, and south of Ireland. The localities given by Capt. Brown are — "In a stream at Clonooney ; in the Shannon and Bresna ; and in some places of the canal adhering to stones," p. 532. In the vicinity of Dublin it occurs in the Grand * This catalogue was dated from Naas Barracks, Ireland, 20th August, 1815, and read before the Wernerian Society of Edinburgh on the 16th of December in that year.
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