74 The Fossil Plants of the Coal Measures. 



differ even now on this point Hence, I cannot conclude 

 that these distinctive features settle the question of the 

 boundary lines between the Ferns and the Cycads. For the 

 present, however, I have arranged my specimens in Seward's 

 two groups, to facilitate their further investigation and 

 study. 



MYELOPTERLS. 

 Primary Petioll. 



Transverse. 



G.— p. 3, Fig. i, C.N. 276. See also C.N. 286, 286b, 286c. 305 

 very large Petiole from Autun. 



Secondary Divisions of Petiole. 



p. 3, Figs. 3, 4, and 4*. See 286a and others from C.N. 286 to 

 292. 



Longitudinal. 

 Priffiary. 



p. 3, Fig. 2, C.N. 298—303. 



Secondary. 



p. 3, Figs. 5 and 6. See C.N. 286, 293 and 4. 



Oblique. 



G.— See C.N. 286c 



Sub-Epidermal jSclerenchyma. 



Transverse. 



C.N. 276. See also 305. 

 Longitudinal. 



C.N. 276f, <£. 



RACHLOPTERLS WILLLAMSONL Seward. 



Transverse. 



C.N. 277 to 282. Five transverse sections from the same entire 

 Petiole. 



Longitudinal. 



C.N. 283, 284, 285. Three sections from the same Petiole as the 

 transverse ones. 



Memoir VII. Figure 7 is a transverse section of a vascular bundle of 

 this plant. 



