160 HISTORICAL PALEONTOLOGY. 



(24) 'Monograph of British Trilobites' ( Palaeontographical 



Society). Salter. 



(25) 'Monograph of British Merostomata ' ( Palaeontograph- 



ical Society). Henry Woodward. 



(26) 'Monograph of British Brachiopoda' ( Palaeontograph- 



ical Society). .Davidson. 



(27) '^Monograph of British Fossil Corals' Palaeontograph- 



ical Society). Milne-Edwards and Haime. 



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



Edwards and Jules Haime. 



(29) "Devonian Fossils of Canada West " ' Canadian Jour- 

 nal, ' new sen, 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. ' Goldfuss. 



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



(37) ' Beitrag zur Palaeontologie des Thuringer-Waldes. ' 

 Richter and Unger. 



(38) ' Ueber die Placodermen des Devonischen Systems. ' 



Pander. 



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



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



CHAPTER XII. 



THE CARBONIFEROUS PERIOD. 



Overlying the Devonian formation is the great and impor- 

 tant 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. 



