THOMAS DAVIDSON, LL.D., F.R.S., of Muirhouse, Midlothian, died, from an attack of lung disease, at West Brighton, on the 16th inst., in his sixty-ninth year. Dr. Davidson, who was so well known in the scientific world, more especially for his work on the “Fossil Brachiopoda,” was a Fellow of the Royal, the Geological, and many other learned Societies, foreign as well as British. In 1851 he began his description of the “British Fossil Brachiopoda,” which has been published from year to year by the Palæontological Society, the concluding supplements having appeared in the last volume of that Society in December 1884. Numerous memoirs on similar subjects have been published in the Transactions of several scientific Societies. Recently Dr. Davidson prepared a “Report on the Brachiopoda dredged by H.M.S. Challenger during the Years 1873-76.” At the time of his death he was engaged upon a further monograph on recent Brachiopoda, the first part of which is now appearing in the Transactions of the Linnean Society. Dr. Davidson latterly resided at Brighton, and notwithstanding his other scientific avocations he devoted a considerable portion of his time to the perfecting of the town museum.