THE ORIGIN OF PLANT LIFE ON THE LAND. loi 



northern parts of the American continent at a time of warm 

 and equable climate, and of elevation of new land out of 

 the Silurian sea. It spread itself to the southward, and was 

 finally destroyed in the great subsidences and disturbances 



Fig. 93.- Group of Devonian Fruits, etc. Middle Devonian, New Brunswick. 



A, CardincarpHin conintnvt. 

 b. Cardiocarpian acutuiit. 



C, CnrdiocarpHUi Crampii. 



D, C'lrdiocarpitni Bailcyi. 



E, Trif;onocarpum racemosnm. 

 e', E-, Fruits enlarged. 



F, Antholttkcs Dcvotiicus. 



f', Fruit of the same. 



c;, Annularia ncutninnfa. 



H, Asterophyllites acicularis. h'. Leaf. 



K, Cardiociirpum. (? young of a.) 



L, Pinmilarin dispalans. 



From Acadian Geology. 



which closed the Devonian age, and which were probably 

 accompanied with refrigeration of climate. It was succeeded 

 by the more massive and richer, but more monotonous flora 

 of the Carboniferous, a period in which large areas of our 



