carbonifl:roi 109 



Devonian period docs not differ essentially from 

 that of the Carboniferous, since both contain the 

 same genera of ferns, of giant reeds allied to the 

 living Equisetum^ and of club-mosses of the size of 

 s, which differ from the Quill-wort and 

 more in size than in structure. 



.\ a- an age of ever- 

 green forest tr< - which did not survive 



the Permian period. No example is known of 

 modern trees; but we cannot infer that 



they did not The abundance of Eucalyptus } 



and of the leafless A Q South Australia 



ra may monopolize 



the . ; and tin- circumstance that both the 



Stralian and African fli at 



the >la\-, pr< >ves that tin- absen< >me 



types from a district of the Earth or deposit, is 



ent with their e\ at the same period 



in another locality. 



v to 



In th 1 )i their fruits they re- 



te of the yew tribe. The living Sii/is- 



buna of China ha- fruits which are of nutlike form, 



and resemble the Coal M« ruits known as 



Trt ' >>i which are produced by the forest 



named Dadoxylon* Under the microscope the 



d of this tree shows characteristic coniferous 

 structure. The tree differs from all conifers of 

 newer age in having a large central pith, formed 

 by a succession of thin transverse layers. Casts 

 of the pith cavity were long supposed to be sepa- 

 rate plants, and named Sterribergia* Cordaites is 

 another conifer of the yew type. And Araucarites 

 has been so named from its resemblance to the 

 living Araucaria. 



The club moss tribe, which at the present day 



