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PLATE LXIV. 



Calamites. 



A remarkable confused mass of broken calamarian 

 stems, being a small portion of a continuous bed or band of 

 the same nature. It affords an excellent insight into the 

 profuse occurrence of these plants, and the manner in 

 which they assisted in the formation of coal — probably 

 more than any other plants. 



An instructive specimen, twice the size of our figure, 

 from the Newcastle coal-field. 



The drawing is by Prior. 



