The Fossil Plants of the Coal Measures. 109 



Inner Cortex. 



M.— p. 466, Fig. 2ib, C.N. 458. 



Outer Middle Cortex. 



M.— p. 466, Fig. 2icl, C.N. 458. 



Prosenchymatous Zone. 



JVI.— p. 466, Fig. 2ie, C.N. 428. 



Vascular Bundles to Halonial Tubercles. 

 M.— p. 467, Fig. 2ifff, C.N. 465. 



Fig. 22, C.N. 461. Fig. 23, C.N. 458. 

 Fig. 24, C.N. 464. 



Leaf-Trace. For comparison witii size of Halonial bundles. 

 M.— p. 467, Fig. 25a, C.N. 465. 



Longtitiidinal. 



See C.N. 1922A, shewing the vertical thread on the trachete. 



C.N. Strobili, probably of L. Wunschianum. 

 Transverse. 



C.N. 437-438. 

 LongtiUidiiiaL 

 C.N. 457- 



Type of Lepidodendron Harcourtii. Withain. 



For many years I failed, in common with most of my 

 contemporaries, to distinguish between this type and my 

 L. fuliginoswn. Hence all references to "Z. Harcourtii" 

 prior to the year 1887 must be regarded as applicable only 

 to L . fiiliginosum. This error was an easy one, because 

 young branches of these two types closely resembled one 

 another. But in fact, after Whitham and Brongniart des- 

 cribed their original specimen, more than forty years elapsed 

 before other fragments of the same type were discovered ; 

 latterly, however, we have been much more fortunate 

 and the identification of each of the above two types has 

 become easy. I now possess beautiful examples of both very 

 young branches of L. Harcourtii invested by their leaves, 

 as well as one of larger dimensions and more advanced 

 growth than Harcourt's classic fragment. 



In the youngest growths which I possess we have what 

 appear to be sections of Halonial tubercles (C.N. 1596 



