THE CARBONIFEROUS: PERIOD. 157 
(22) ‘Monograph of the Fishes of the Old Red Sandstone of Britain’ 
(Palzeontographical Society). Powrie and Lankester. 
(23) ‘ Fishes of the Devonian System, Paleontology of Ohio.’ New- 
berry. 
(ea)r5 Mine eiph of British Trilobites’ (Palzeontographical Society). 
Salter. 
(25) ‘ Monograph of British Merostomata’ (Palzeontographical Society). 
Henry Woodward. 
(26) ‘Monograph of British Brachiopoda’ (Palzeontographical Society). 
Davidson. 
(27) ‘ Monograph of British Fossil Corals’ (Palzeontographical 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) ‘ Palzontology of New York,’ vol. iv. James Hall. 
(31) ‘ Thirteenth, Fifteenth, and Twenty-third Annual Reports on the 
State Cabinet.’ James Hall. 
(32) ‘ Palzeozoic 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 Germaniz.’ Goldfuss. 
(36) ‘ Versteinerungen der Grauwacken-formation,’ &c. Geinitz. 
(37) ‘ Beitrag zur Palzeontologie 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. . Xb 
THE CARBONIFEROUS PERIOD. 
Overlying the Devonian formation is the great and import- 
ant series of the Carbonzferous 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. 
