(1) ‘Siluria.’  Sir Roderick Murchison.
 (2) ‘Geology of Russia in Europe.’  Murchison (with M. de Verneuil
     and Count von Keyserling).
 (3) ‘Bassin Silurien de Boheme Centrale.’  Barrande.
 (4) ’Introduction to the Catalogue of British Palaeozoic Fossils in
     the Woodwardian Museum of Cambridge.’  Sedgwick.
 (5) ‘Die Urwelt Russlands.’  Eichwald.
 (6) ‘Report on the Geology of Londonderry, Tyrone,’ &c.  Portlock.
 (7) “Geology of North Wales”—­’Mem.  Geol.  Survey of Great Britain,’
     vol. iii.  Ramsay.
 (8) ‘Geology of Canada,’ 1863.  Sir W. E. Logan; and the ’Reports of
     Progress of the Geological Survey’ since 1863.
 (9) ‘Memoirs of the Geological Survey of Great Britain,’
(10) ’Reports of the Geological Surveys of the States of New York,
     Illinois, Ohio, Iowa, Michigan, Vermont, Wisconsin, Minnesota,’
     &c.  By Emmons, Hall, Worthen, Meek, Newberry, Orton, Winchell,
     Dale Owen, &c.
(11) ‘Thesaurus Siluricus.’  Bigsby.
(12) ‘British Palaeozoic Fossils.’  M’Coy. (13) ‘Synopsis of the Silurian Fossils of Ireland,’ M’Coy. (14) “Appendix to the Geology of North Wales”—­’Mem.  Geol.  Survey,’
     vol. iii.  Salter.
(15) ’Catalogue of the Cambrian and Silurian Fossils in the
     Woodwardian Museum of Cambridge.’  Salter.
(16) ‘Characteristic British Fossils.’  Baily.
(17) ‘Catalogue of British Fossils.’  Morris.
(18) ‘Palaeozoic Fossils of Canada.’  Billings.
(19) ‘Decades of the Geological Survey of Canada.’  Billings,
     Salter, Rupert Jones.
(20) ‘Decades of the Geological Survey of Great Britain.’  Salter,
     Edward, Forbes.
(21) ‘Palaeontology of New York,’ vols. i.-iii.  Hall.
(22) ‘Palaeontology of Illinois.’  Meek and Worthen. (23) ‘Palaeontology of Ohio.’  Meek, Hall, Whitfield, Nicholson. (24) ‘Silurian Fauna of West Tennessee’ (Silurische Fauna des
     Westlichen Tennessee).  Ferdinand Roemer.
(25) ‘Reports on the State Cabinet of New York.’  Hall.
(26) ‘Lethaea Geognostica.’  Bronn.
(27) ‘Index Palaeontologicus.’  Bronn.
(28) ‘Lethaea Rossica.’  Eichwald.
(29) ‘Lethaea Suecica.’  Hisinger.
(30) ‘Palaeontologica Suecica.’  Angelin.
(31) ‘Petrefacta Germaniae.’  Goldfuss. (32) ‘Versteinerungen der Grauwacken-Formation in Sachsen.’  Geinitz. (33) ‘Organisation of Trilobites’ (Ray Society).  Burmeister. (34) ‘Monograph of the British Trilobites’ (Palaeontographical
     Society).  Salter.
(35) ‘Monograph of the British Merostomata’ (Palaeontographical Society). 
     Henry Woodward.
(36) ‘Monograph of British Brachiopoda’ (Palaeontographical Society). 
     Thomas Davidson.
(37) ‘Graptolites of the Quebec Group.’  James Hall. (38) ‘Monograph of the British Graptolitidae.’  Nicholson. (39) ’Monographs on the Trilobites.  Pteropods, Cephalopods,
     Graptolites,’ &c.  Extracted from the ’Systeme Silurien du Centre
     de la Boheme.’  Barrande.
(40) ‘Polypiers Fossiles des Terrains Paleozoiques,’ and ’Monograph
     of the British Corals’ (Palaeontographical Society).  Milne
     Edwards and Jules Haime.