328 



DESCRIPTIVE CATALOGUE 



seen in one or two irregular patches of tracheids arranged in 

 more or less regular radial rows. These masses of secondary 

 wood are not visible in the traces in the inner wood-zones- as, 

 for example, in the trace photographed in text-fig. Ill, where 

 no definite xylem-mass can be detected. 



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Text-f5g. Ul.Colymbcte Fdirardsi, sp. nov. A leaf-trace passing out 

 through the wood, in tangential section. No. V. 0132.;. 



AFFINITIES. The extraordinary alternation of successive 

 horizontal and vertical wood-cylinders in the new fossil, is 

 a feature unlike any in living or fossil plants with which 

 I am acquainted. \Vhile the transverse section, with its 



