(1) 'Siluria.' Sir Roderick Murchison. (2) 'Geology of Russia in Europe.' Murchison (together with De Verneuil and Count von Keyserling). (3) "Classification of the Older Rocks of Devon and Cornwall"--'Proc. Geol. Soc.,' vol. iii., 1839. Sedgwick and Murchison. (4) "On the Physical Structure of Devonshire;" and on the "Classification of the Older Stratified Rocks of Devonshire and Cornwall"--'Trans. Geol. Soc.,' vol. v., 1840. Sedgwick and Murchison. (5) "On the Distribution and Classification of the Older or Palæozoic Rocks of North Germany and Belgium"--'Geol. Trans.,' 2d ser., vol. vi., 1842. Sedgwick and Murchison. (6) 'Report on the Geology of Cornwall, Devon, and West Somerset.' De la Beche. (7) 'Memoirs of the Geological Survey of Ireland and Scotland.' Jukes and Geikie. (8) "On the Carboniferous Slate (or Devonian Rocks) and the Old Red Sandstone of South Ireland and North Devon"--'Quart. Journ. Geol. Soc.,' vol. xxii. Jukes. (9) "On the Physical Structure of West Somerset and North Devon;" and on the "Palæontological Value of Devonian Fossils"--'Quart. Journ. Geol. Soc.,' vol. iii. Etheridge. (10) "On the Connection of the Lower, Middle, and Upper Old Red Sandstone of Scotland"--'Trans. Edin. Geol. Soc.,' vol. i. part ii. Powrie. (11) 'The Old Red Sandstone,' 'The Testimony of the Rocks,' and 'Footprints of the Creator.' Hugh Miller. (12) "Report on the 4th Geological District"--'Geology of New York,' vol. iv. James Hall. (13) 'Geology of Canada,' 1863. Sir W. E. Logan. (14) 'Acadian Geology.' Dawson. (15) 'Manual of Geology.' Dana. (16) 'Geological Survey of Ohio,' vol. i. (17) 'Geological Survey of Illinois,' vol. i. (18) 'Palæozoic Fossils of Cornwall, Devon, and West Somerset.' Phillips. (19) 'Recherches sur les Poissons Fossiles.' Agassiz. (20) 'Poissous de l'Old Red.' Agassiz. (21) "On the Classification of Devonian Fishes"--' Mem. Geol. Survey of Great Britain,' Decade X. Huxley. (22) 'Monograph of the Fishes of the Old Red Sandstone of Britain' (Palæontographical Society). Powrie and Lankester. (23) 'Fishes of the Devonian System, Palæontology of Ohio.' Newberry. (24) 'Monograph of British Trilobites' (Palæontographical Society); Salter. (25) 'Monograph of British Merostomata' (Palæontographical Society). Henry Woodward. (26) 'Monograph of British Brachiopoda' (Palæontographical Society). Davidson. (27) 'Monograph of British Fossil Corals' (Palæontographical Society). Milne-Edwards and Haime. (28) 'Polypiers Foss. des Terrains Paléozoiques.' Milne-Edwards and Jules Haime. (29) "Devonian Fossils of Canada West"--'Canadian Journal,' new ser., vols. iv.-vi. Billings. (30) 'Palæontology of New York,' vol. iv. James Hall. (31) 'Thirteenth, Fifteenth, and Twenty-third Annual Reports on the State Cabinet.' James Hall. (32) 'Palæozoic Fossils of Canada,' vol. ii. Billings.