(complete), VIII, 1-16 (complete), 4to, St. Petersburg, 1864-5. Bulletin de l’Académie Impériale des Sciences de St. Petersbourg; Tome VII, Feuilles 12-36, VIII 1-36. Royal Horticultural Society’s Proceedings; vol. IV, No. 10, vol. V, Nos. 4-9, 8vo. London, 1865. Journal of the Royal Horticultural Society; new series, vol. 1, part 1., 8vo. London, 1866. Defense des Colonies, III, par Joachim Barrande; 8vo. Prague, 1865. Fragmenta Phytographiæ Australiæ, F. Müller; vol. IV. 8vo, Melbourne, 1863-4. Vegetation of Chatham Islands, F. Müller, 8vo. Melbourne, 1864. Analytical drawings of Australian Mosses, edited by F. Müller, 1 Fascicle, 8vo. Melbourne, 1864. Plants indigenous to the Colony of Victoria, Lithograms, by F. Müller, 4to, 1864-5. Review of American Birds in the Museum of the Smithsonian Institution, by S. F. Baird; Part 1, Middle and North America, 8vo. Washington. Illustrated Catalogue of the Museum of Comparative Zoology, No. II, North American Acalephæ, by A. Agassiz; 4to, Cambridge, 1865. All of the above publications were presented by the authors or the Societies publishing the same; those published in Europe were forwarded and received through the medium of the Smithsonian Institution. Mr. Dall presented the following paper: On a New Subfamily of Fluviatile Mollusca. BY W. H. DALL, ACTING DIRECTOR SCI. CORPS, W. U. T. EX. A paper was read by Dr. Isaac Lea, before the Philadelphia Academy of Natural Sciences, April 1st, 1856, in which he described a new genus (_Pompholyx_) and species (_P. effusa_, Lea) of fluviatile mollusca, from California. He placed it in the _Family_ LYMNÆANA without remark. In the “_Genera of Recent mollusca_,” by H. & A. Adams, it is referred to (Vol. II, p. 645, Pl. CXXXVIII, fig. 11) as the only species of the genus and is placed in the _Family_ LIMNÆIDÆ. It is not mentioned by Chenu, in the “_Manuel de Conchyliologie_.” In the “_Supplementary Report to the British Association_,” by Dr. P. P. Carpenter (page 674), are given the views of Mr. W. G. Binney, one of the most eminent of American conchologists and particularly devoted to the Pulmonates. He places the mollusk in question, between the genera _Limnæa_ and _Physa_, in the _Subfamily_ LIMNÆINÆ, of the _Family_ LIMNÆIDÆ. Investigations as to the animal, however, suggest the propriety of separating it, if not (as a _Family Pompholidæ_) entirely from the _Family_ LIMNÆIDÆ, at least in a subfamily by itself. In the few specimens which I have been able to examine with regard to the dentition, the dried animal has not yielded very satisfactory results, and I do not, therefore, feel justified in entirely separating it until more is known. In the following table, a West Coast species is given as a type of each genus: CLASS PULMONATA. _Family_ LIMNÆIDÆ, H. & A. Ads. _Subfamily_ LIMNÆINÆ, H. & A. Ads. West Coast Genera: