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CALAMITES DECORATUS. 

 ORNAMENTED CALAMITE. 



Generic Character. 



Stem jointed, longitudinally striated ; impressions at the articulations usually 

 forming* rings round the trunk. 



Specific Character. 



CALAMITES decoratus. Stem arborescent ; joints short, decreasing in length 

 towards the summit, where they form an enlarged blunt head ; stria tuberculated at 

 bottom close to the articulation ; those of the head very broad. 



Synonyms. 



Phytolithus sulcatus. American Philosophical Transactions, new ser. vol. 1, 

 pi. 5. f. 1. 



Description and Locality. 



Stem jointed, sometimes three feet in length and two to four inches in diameter, 

 terminating upwards in an enlarged blunt head. 



Joints shorter than the diameter of the stem, longitudinally striated, tubercu- 

 lated at the lower extremity of the strise, close to the articulation ; the joints be- 

 coming shorter, the stride broader, and the tubercles larger towards the summit. 



Found imbedded, both horizontally and upright, in the Lea-brook quarry, 

 Yorkshire, and in many other places ; as also frequently in ironstone. 



Observation. 



The situation of the tubercles at the lower extremity of the strice is a striking 

 feature of this species, and the termination is also remarkable for its obtuseness. 



