THE CARBONIFEROUS PERIOD. 157 



(22) ' Monograph of the Fishes of the Old Red Sandstone of Britain.' 



(Palaeontographical Society). Powrie and Lankester. 



(23) ' Fishes of the Devonian System, Palaeontology of Ohio.' New- 



berry. 



(24) ' Monograph of British Trilobites ' (Palaeontographical Society). 



Salter. 



(25) ' Monograph of British Merostomata ' (Palgeontographical Society). 



Henry Woodward. 



(26) ' Monograph of British Brachiopoda ' (Palaeontographical Society). 



Davidson. 



(27) ' Monograph of British Fossil Corals' (Palseontographical Society). 



Milne-Edwards and Haime. 



(28) ' Polypiers Foss. des Terrains Paleozoiques. ' Milne-Edwards 



and Jules Haime. 



(29) " Devonian Fossils of Canada West " ' Canadian Journal,' new ser., 



vols. iv.-vi. Billings. 



(30) 'Palaeontology of New York,' vol. iv. James Hall. 



(31) 'Thirteenth, Fifteenth, and Twenty-third Annual Reports on the 



State Cabinet.' James Hall. 



(32) ' Palaeozoic Fossils of Canada,' vol. ii. Billings. 



(33) ' Reports on the Palaeontology of the Province of Ontario for 1874 



and 1875.' Nicholson. 



(34) " The Fossil Plants of the Devonian and Upper Silurian Formations 



of Canada" ' Geol. Survey of Canada. ' Dawson. 



(35) ' Petrefacta Germaniae.' Gold fuss. 



(36) ' Versteinerungen der Grauwacken -formation.' &c. Geinitz. 



(37) ' Beitrag zur Palaeontologie des Thiiringer-Waldes.' Richter and 



Unger. 



(38) ' Ueber die Placodermen der Devonischen System.' Pander. 



(39) ' Die Gattungen der Fossilen Pflanzen.' Gceppert. 



(40) ' Genera et Species Plantarum Fossilium.' Unger. 



CHAPTER XII. 

 THE CARBONIFEROUS PERIOD. 



Overlying the Devonian formation is the great and import- 

 ant series of the Carboniferous Rocks, so called because workable 

 beds of coal are more commonly and more largely developed 

 in this formation than in any other. Workable coal-seams, 

 however, occur in various other formations (Jurassic, Cretace- 

 ous, Tertiary), so that coal is not an exclusively Carboniferous 

 product ; whilst even in the Coal-measures themselves the coal 

 bears but a very small proportion to the total thickness of 

 strata, occurring only in comparatively thin beds intercalated 

 in a great series of sandstones, shales, and other genuine 

 aqueous sediments. 

 12 



