The Fossil Plants of the Coal Measures. 71 



RACHIOPTERIS RAMOS A* Will. 



Stem. 



Transverse. 



S. — p. 261, Fig. 19a, C.N. 1851A. 

 Longitudinal. 



p. 261, Fig. 20, C.N. 1918B. 



BRANCHES. 

 Transverse. 



S. — p. 262, Fig. 21. A primary branch, C.N. 1851. 



p. 262, Figs. 22 and 23. Secondary branches, C.N. 1851. 

 p. 262, Fig. 24. A yet more distal twig, C.N. 1851. 



Tracheids. 



Fig. 25. Reticulate Tracheids from the axial bundle a of 

 Fig. 20, C.N. 1918B. 



Epidermal hairs. 



p. 262, Fig. 26. Portion of Cortex, with its peculiar hairs in situ, 

 C.N. 1918D. 



p. 262, Fig. 27. Two isolated epidermal hairs, C.N. 1918C. 



p. 262, Fig. 28. The base of one of the secondary vascular bun- 

 dles, Fig. 19c, where the tracheids are suddenly deflected 

 laterally from the central bundle, a. 



PSA R ONI US RENAULTII. Will. 

 Part of Stem. 



Transverse. 



M. — p. 464, Fig. 16. Part of the Cortex of an arborescent stem, enclo- 

 sing one perfect vascular bundle, a, and a portion of second, a, 

 C.N. 309. 



G. — p. 12, Figs. 22* and 22**. Original in Mr. Carruthers' Cabinet. 



p. 11, Fig. 18. Cluster of serial roots in the Cortex, C.N. 311. 



p. 11, Fig. 19. Vascular bundles at d,d, Cortex, i, with serial 

 roots at C.C. See C.N. 312, 313, and 314. 



p. 11, Fig. 20. Cortex with serial roots, C.N. 



p. 11. Fig. 21. Part of Fig. 18, further enlarged. 



SPORANGIA OF FERNS.f 



H.— p. 220, Fig. 27, C.N. 1459. 



p. 220, Fig. 28, C.N. 1460, p. 220, Fig. 29, C.N. 1460. <^ 



p. 220, Fig. 30, C.N. 147 1. Q_ 



* It is possible that this plant may only be a variety of Rachiofiteris hirsuta. 



t When Memoir VIII. was published I was under the impression that each of these 

 sporangia possessed an annulus. _ This is probably true of the rare form, Fig. 25, though I 

 have no certain evidence that this was the case ; but it is not true of the more common York- 

 shire and Lancashire form, Figs. 27 — 30. 



