The Fossil Plants of the Coal Measures. 69 



Cortex. 



Transverse. 



Most of the specimens. 



Longitudinal. 



See C.N. 229 to 236. 



The specimens from which Figs. 35A to 35K were drawn are in the 

 Cabinet of Wm. Carruthers, Esq., of the Natural History- 

 Museum, Cromwell Road, London. 



Zygopteroid Petiole, Vascular Bundle. 



P. -p. 157, Fig. 3 f, C.N. 1831.* 



AXIL-SPROSSE OF STENZEL.t 



P.— p. 156, Fig. 3e and Fig. 5a, C.N. 1831. 



RACHIOPTERIS OLDHAMIUM. 

 Transverse. 

 Matured. 

 F. — p. 685, Fig. 20. See C.N. 160. Very young twigs, 

 p. 685, Figs. 22, 23, 24. See 160 and 167, 

 p. 685, Fig. 21, C.N. 160. Rather more advanced, 

 p. 686, Fig. 25A, see C.N. 150, '1/ C.N. 156, with a triangular 



bundle, 

 p. 686, Fig. 26. With two secondary bundles becoming detached 

 from the primary one. 



Longitudinal. 



p. 686, Fig. 27, C.N. 162. A bifurcating young branch, 

 p. 685, Fig. 25, C.N. 161. 



RACHIOPTERIS CORRUGATA. Will. 

 Stem or Rhizome. 



Transverse. 



H. — p. 214, Figs 2 to 12 + C.N. 245 to 255 inclusive. 



Medulla. 



Transverse. 



H. — p. 214, Fig. 13a, with its several narrow outward extensions, 

 a', a', C.N. 247; also Fig. 4b, C.N. 247. 



Longihidinal. 



p. 214, Fig. 14a, C.N. 260. 



* To place this petiole in its normal position relative to the axil cylinders, Figs, ih and 

 2b, we must recognise in Fig. 2b' the representative of Fig. 3e — i.e., the <: axil-sprosse" of 

 Stenzel — the petiole j Fig. 3, not being preserved in Fig. 2. 



t Its normal position in the stem being external to the Zygopteris Petiole. See C.N. 1831 



t A series of eleven sections from the same stem, cut in the order of their consecutive 

 numbers, and showing the variations in the primary tracheal cylinder, b, in the larger 

 petiolar bundles, c, in the smaller branch bundles,^, d, I, as well as the peripheral outline of 

 the cortex,/; /', where the petiolar bundle, c, is gradually becoming the centre of a true 

 petiole in Fig. 10, c. 



