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Rh observations made chiefly in the western division of the county.

2. Mr. Weaver's account of the Mollusca to be found in the parish of Harting, near Petersfield, contained in Mr. Gordon's recently published work, 'The History of Harting,' pp. 307–323.

3. "A Season's Collecting of Land- and Freshwater Shells in West Sussex," by William Jeffery. Published in 'The Zoologist' for 1868, pp. 1215–1217.

4. "A List of Land and Freshwater Mollusca which have been met with in the Neighbourhood of Brighton," published in Merrifield's 'Sketch of the Natural History of Brighton' (1864, p. 223).

5. "A List, with Notes on the Habitats and Localities, of the Land and Freshwater Mollusks observed in the Vicinity of Lewes, in Sussex," by W.C. Unwin, Esq. Published in 'The Naturalist' for 1853, vol. hi., pp. 54–58.

6. A List of the Mollusca which have been found in the neighbourhood of Eastbourne; prepared, with other provisional lists of the Fauna and Flora of the District, by a Committee of the Natural History Society of Eastbourne, and published in Gowland's 'Guide to Eastbourne,' 8th edition.

7. The Editor's own notes of species collected, or identified, in excursions made in different parts of the county during the last fifteen years.

The letters B, W, J, M, U, G, and H, which will be found appended to observations throughout the catalogue are the initial letters of the writers' names above mentioned, and indicate the authority for the various statements to which they are appended. The systematic arrangement is that adopted in the first volume of Mr. Gwyn Jeffreys' 'British Conchology.'

Arion ater. The Black Slug.—Found in the neighbourhood of Horsham, Cowfold, and West Grinstead, where black, white and