THE CARBONIFEROUS PERIOD. 191 



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 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 Carboniferous rocks and 

 fossils may I'efer : 



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



trict.' 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 Palae- 



ontology). Meek, Worthen, &c. 



(8) ' Reports of the Geological Survey of Ohio ' (Geology and Palaeon- 



tology). Newberry, Cope, Meek, Hall, &c. 



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



Carbonifere de la Belgique,' 1843 ; with subsequent monographs 

 on the genera Productus and Chonetes, on Crinoids, on Ccwals, 

 &c. De Koninck. 



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



(n) ' 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 ' (Palseon- 



tographical Society). Davidson. 



(15) ' Monograph of the British Carboniferous Corals ' (Palaeontographical 



Society). Milne-Edwards and Haime. 



(16) ' Monograph of the Carboniferous Bivalve Entomostraca of Britain' 



(Palaeontographical Society). Rupert Jones, Kirkby, and George 

 S. Brady. 



