THE CARBONIFEROUS PERIOD. 



165 



which date from the Devonian. The simply herbaceous ferns 

 are extremely numerous, and belong to such widely-distributed 



Fig. 109. Calamites cannesformis. Carboniferous Rocks, Europe and 

 North America. 



and largely-represented genera as Neuropteris, Odontopteris (fig. 



1 08), Alethopteris, Pecopteris, Sphenopteris, Hymenophyllites, &c. 



The fossils known as Calamites (fig. 109) are very common 



