144 Obituary — J. Gwi/n Jeffreys. 



On the Discovery of Supposed Human Eemains in the Tool-bearing Drift of Moulin- 



Quignou. Anthropol. Review, 1863, vol. i. pp. 166-168. 

 On the Interval of Time which has passed between the Formation of the Upper and 



Lower Valley- Gravels of England and France. Quart. Joui'u. Geol. See. 1866, 



vol. xxii. pp. 463-468. 

 On the Amiens Gravel. Quart. Journ. Geol. Soc. 1868, vol. xxiv. pp. 103-125 ; Geol. 



Mag. 1867, Vol. IV. p. 105 ; Silliman's Journ. Science, vol. xlvi. pp. 302-327. 

 On the Quaternary Gravels of England. Quart. Journ. Geol. Soc. vol. xxiv. 1868, 



p. 455, and vol. xxv. 1869, pp. 57-100 ; Geol. Mag. 1868, Vol. V. pp. 338-339. 

 Discovery of a Pleistocene Freshwater Deposit, with Shells, at Highbury New Park, 



near Stoke Newington. Geol. Mag. 1868, Vol. V. pp. 391-392. 

 On the Formation of Deltas, and on the Evidence and Cause of Great Changes of 



Sea-Level during the Glacial Period. Quart. Journ. Geol. Soc. 1869, vol. xxv. 



p 9 (abstract). Geol. Mag. 1868, Vol. VI. pp. 576-577. 

 The same Paper as above brought up to date. Geol. Mag. 1872, Vol. IX. pp. 



392-399, 485-500. 

 On the Action and Formation of Rivers, Lakes, and Streams, with Remarks on 



Denudation and the Causes of the Great Changes of Climate which have oeciu-red 



just prior to the Historical Period. Geol. Mag. 1875, Decade 11. Vol. XI. 



pp. 433-476. 

 Denuding Agencies and Geological Depositions under the Flow of Ice and Water, 



with the Laws which Regulate these Actions. Quart. Journ. Geol. Soc. 1876, 



vol. xxxii. pp. 4-9 ; Geol. Mag. 1876, Decade II. Vol. III. pp. 90-93. 



JOHN GWYN JEFFREYS, LL.D., F.R.S., F.L.S., F.G.S. 



BoBN January 18, 1809, Died January 24, 1885. 



Dr. J. Gwyn Jeffreys was born at Swansea, January 18th, 1809, 

 and while yet a boy showed considerable taste for natin-al history, 

 by collecting the insects and shells of South Wales. When only 19 

 be read a paper at the Linnean Society ; and from that date until 

 bis decease he has contributed by his writings to our knowlei^ge 

 of the Molluscan fauna of Europe, and the North Atlantic. His 

 most important works are his "British Conchology," and a series of 

 papers in the Proceedings of the Zoological Society, and the Reports 

 of the British Association. At the age of 20 he was elected a Fellow 

 of the Linnean Society, and in 1840 a Fellow of the Royal Society, 

 and an Honorary LL.D. of St. Andrews. He was elected a Fellow 

 of the Geological Societj^ in 1861. He took great interest in the 

 meetings of the British Association, and was Local Treasurer at the 

 1st meeting at Swansea in 1848, and a Vice-President when the last 

 meeting was held in the same town in 1880. In 1877 he was 

 chosen President of the Biological Section. For many years he 

 filled the office of Treasurer of the Linnean Society, and also of the 

 Geological Society. He took part with Dr. W. B. Carpenter and 

 the late Sir Wyville Thomson in their researches in deep-sea-sound- 

 ings made by the "Valorous," the "Lightning," and "Porcupine" 

 expeditions. He greatly interested himself in the labours of those 

 French, Belgian, and Italian palaeontologists, who devoted themselves 

 to the investigation of the Newer Pliocene deposits of Europe, and 

 many of his own papers have an important bearing upon the Shells of 

 the Glacial Beds in this country. He died at his town-residence (1, 

 The Terrace, Kensington) on Saturday, Jan. 24, 1885, aged 76 years. 



