TJie Fossil Plants of the Coal Measures. 127 



sub-divisions of each root, beside some other obscure 

 features respecting which the descriptions are vague and 

 somewhat conflicting. The results of early observations 

 are given in Memoir II. (B). 



B, — p. 216, Fig. 53, a diagrammatic restoration of a root and rootlets. 

 See also in C, fig. 37, a diagram illustrating the relations of the 

 tissues of the stems to those of the Stigniarian roots and rootlets. 



Medulla. 



B. — Transverse, p. 216, Fig. 37a. 

 Longitudinal, p. 216, Fig. 43a. 



Xylem. — This is only a prolongation of the secondary xylem strand of the 

 aerial stem ; the primary tracheal cylinder not being prolonged into the 

 roots. 

 B. — Tangential, p. 216, Fig. 48. 



Longitudinal, p 216, Fig. 43e , Fig. 446. 



Transverse, p. 217, Fig. 476, 5ie. 



Primary Medullary Rays. 



B. — Tangential, p. 216. Fig. 48f'. 

 Transverse, p. 217, Fig. 47f , 

 Vertical radial, p. 217, Fig. 43f', Fig. 44f. 

 Secondary medullary rays, p. 217, Figs. 45f and 46. 

 Cortex. 



Innermost zone. 



B. — Longitudinal, p. 218, Fig. 44g, 49g. 



Prosenchymatoiis zone. 



B- — Transverse, p. 218, Fig. 52k, 51k. 

 Longitudinal, p. 218, Fig. 50. 



Outermost Cortex. 



B.- — Transverse, p. 219, Fig. 51k. Fig. 52I. 



Rootlets, 



B. — Longitudinal, p. 219, Fig. 5ioo, 5200. 

 K. — Transverse, p. 292, Figs. 13 to 20. 



Origin of Rootlet Bundles. 



B. — p. 216, Fig. 44n. Fig. 47n. 



For more complete detailed descriptions of Stigmaria 

 consult my Monograph Y. In it the references to the 

 figures and descriptions of the various organs are so 

 minutely given in the index to the plates that it is un- 

 necessary to repeat them here. 



