LIST OF PAPERS. Page BAIKIE, Dr. Extract of a Letter from Dr. Baikie to Sir John Richardson, BATE, C. Spence, Esq., F.L.S. .... 76 On the Importance of an Examination of the Structure of the BELL, THOMAS, Esq., P.L.S. Description of a new Genus of Crustacea, of the Family Pinno- DARWIN, CHARLES, Esq., F.R.S., F.L.S., & F.G.S., and WALLACE, On the Tendency of Species to form Varieties; and on the Per- HANBURY, DANIEL, Esq., F.L.S. 1 27 45 Note on Two Insect-products from Persia 178 HIGGINS, Rev. HENRY. Death of the Common Hive Bee; supposed to be occasioned by 29 HUXLEY, T. H., Esq., F.R.S., Professor of Natural History, Government School of Mines. On some points in the Anatomy of Nautilus Pompilius .......... 36 iv Page Contributions to the Anatomy and Natural History of the Cetacea. 63 SMITH, FREDERICK, Esq., Assistant in the Zoological Department in Catalogue of the Dipterous Insects collected in the Aru Islands by Mr. A. R. Wallace, with Descriptions of New Species...... 77 Catalogue of the Heterocerous Lepidoptera collected at Singapore by Mr. A. R. Wallace, with Descriptions of New Species...... 183 Catalogue of the Heterocerous Lepidopterous Insects collected at Malacca by Mr. A. R. Wallace, with Descriptions of New WALLACE, ALFRED R., Esq., and DARWIN, CHARLES, Esq., F.R.S., On the Tendency of Species to form Varieties; and on the WASHINGTON, Captain. Natural-History Extracts from the Journal of Captain Denham, WETHERELL, JOHN W., Esq. Notice of the occurrence of recent Worm Tracks in the Upper 45 PROCEEDINGS OF THE LINNEAN SOCIETY OF LONDON. November 5th, 1857. Thomas Bell, Esq., President, in the Chair. The Secretary announced that during the recess an additional pair of Cabinets for the Society's Collection of Fruits and Seeds had been presented by Thomas Corbyn Janson, Esq., F.L.S.; and the special thanks of the Society were directed to be presented to Mr. Janson for this useful and acceptable present. Dr. Berthold Seemann, F.L.S., read a detailed report of his visit to Montreal, as the representative of the Linnean Society at the Meeting of the American Association for the Advancement of Science in that city, of which the following is an abstract :— Availing himself of the free passage placed at the disposal of the Linnean Society by the liberality of the British and North American Royal Mail Steam Packet Company, Dr. Seemann embarked at Liverpool on the 25th of July, on board the 'Persia,' and arrived at New York on the 5th of August. Thence he continued his journey by railway, via Albany and Burlington, to Montreal, which he reached a few days previous to the commencement of the meeting, and was most hospitably received, and treated with much consideration by the Local Committee, including Sir William Logan, F.R.S. (the Chairman), the Lord Bishop of Montreal, Professor Dawson, and other distinguished men. On the 11th, Dr. Seemann was introduced by Lieut.-Colonel Munro, LINN. PROC. a F.L.S., at his conversazione, to Professor Caswell, of New Providence, the Acting President, and to Professor Lovering, of Cambridge, Massachusetts, the Secretary of the Meeting; and on the following day presented to them the official letter of the President of the Linnean Society, of which he was the bearer. Both gentlemen expressed themselves highly gratified with the attention shown by the Linnean Society in sending a delegate to the meeting, and showed him marked attention during its continuance. He was also introduced in his official capacity to Sir W. Eyre, K.C.B., Acting Governor-General of Canada, who complimented the Linnean Society on the encouragement given by it to the first meeting of the American Association held on British ground. The meetings were held in the New Court House at Montreal, commencing on the 12th of August and lasting for a week. Professor Caswell opened the session with a powerful speech, in the course of which he announced the presence of delegates from the Geological and Linnean Societies of London, and introduced Professor Ramsay and Dr. Seemann to the meeting. In his reply, Dr. Seemann took occasion to express the high esteem and respect of the Linnean Society for the American Association, and the deep interest with which the Society regarded its labours, and to offer in the name and on the behalf of the Linnean Society the most sincere wishes for the unabated continuance of that success which had hitherto attended it. The number of members attending the meeting amounted to upwards of five hundred, the greater part of whom had come from the United States, although Canada and the other British provinces of North America were, in proportion to their extent and population, equally well represented. It was generally considered to be one of the most successful meetings that had been held in any part of the American continent. Geologists were in great force; Physicists and Ethnologists were also numerous; but there was a comparatively small attendance of Botanists and Zoologists. Dr. Seemann attended daily, and at one of the meetings read a Paper "On the so-called Parthenogenesis in Animals and Plants," in which he presented a summary of the present state of that interesting question. Two other Fellows of the Linnean Society were also present at the meeting, viz. the Rev. William Hincks, Professor of Natural History in the University of Toronto, and Lieut.Colonel Munro, in command of the 39th Regiment, stationed at Montreal, both of whom showed Dr. Seemann great attention. Of our Foreign Members, there were present, Professor Dana, of |