THE CARBONIFEROUS PERIOD. 195 



Carboniferous Labyrinthodonts are of no great size, some of 

 them very small, but others attain comparatively gigantic 

 dimensions, though all fall short in this respect of the huge 

 examples of this group which occur in the Trias. One of the 

 largest, and at the same time most characteristic, forms of the 

 Carboniferous series, is the genus Anthracosaurus, the skull of 

 which is here figured. 



No remains of the true Reptiles, Birds, or Quadrupeds have 

 as yet been certainly detected in the Carboniferous deposits in 

 any part of the world. It should, however, be mentioned, 

 that Professor Marsh, one of the highest authorities on the 

 subject, has described from the Coal-formation of Nova Scotia 

 certain vertebrae which he believes to have belonged to a 

 marine reptile (Eosaurus Acadianus), allied to the great 

 Ichthyosauri of the Lias. Up to this time no confirmation 

 of this determination has been obtained by the discovery of 

 other and more unquestionable remains, and it therefore remains 

 doubtful whether these bones of Eosaurus may not really belong 

 to large Labyrinthodonts. 



LITERATURE. 



The following list contains some 'of the more important of the 

 original sources of information to which the student of Carbonif- 

 erous rocks and fossils may refer : 



(1) 'Geology of Yorkshire,' vol. ii. ; 'The Mountain Lime- 



stone District. ' John Phillips. 



(2) ' Siluria. ' Sir Roderick Murchison. 



(3) ' Memoirs of the Geological Survey of Great Britain and 



Ireland. ' 



(4) ' Geological Report on Londonderry, ' &c. Portlock. 



(5) ' Acadian Geology. ' Dawson. 



(6) ' Geology of Iowa. ' vol. i. James Hall. 



(7) 'Reports of the Geological Survey of Illinois' (Geology 



and Palaeontology). Meek, Worthen, &c. 



(8) 'Reports of the Geological Survey of Ohio' (Geology 



and Palaeontology). Newberry, Cope, Meek, Hall, &c. 



(9) ' Description des Animaux fossiles qui se trouvent dans le 



Terrain Carbonifere de la Belgique, ' 1843; with sub- 

 sequent monographs on the genera Productus and 

 Chonetes, on Crinoids, on Corals, &c. De Koninck. 



(10) 'Synopsis of the Carboniferous. Fossils of Ireland.' 



M'Coy. 

 (u) 'British Palaeozoic Fossils.' M'Coy. 



(12) 'Figures of Characteristic British Fossils.' Baily. 



(13) 'Catalogue of British Fossils.' Morris. 



(14) ' Monograph of the Carboniferous Brachiopoda of Britain 



(Palaeontographical Society). Davidson. 



(15) 'Monograph of the British Carboniferous Corals' 



Palseontographical Society). Milne-Edwards and Haime. 



