OF THE FOSSIL PLANTS OF THE COAL-MEASUKES. 
703 
Plate LVI. fig. 39. Transverse section of a large secondary petiole, magnified 8 
diameters. 
Plate LV. fig. 40. Transverse section of a yet smaller secondary petiole, magnified 8 
diameters. 
„ fig. 41. Transverse section of a petiole, resembling fig. 39, from Oldham, 
enlarged 16 diameters. 
Plate LVI. fig. 41 A. Another petiole, from Oldham, similar to fig 41, enlarged 16 
diameters. 
Rachiopteris Lacattii. 
Plate LVI. fig. 42. Transverse section of a petiole, magnified 16 diameters. 
Plate LVII. fig. 43. Longitudinal section, giving off a vascular bundle to a secondary 
petiole, magnified 20 diameters. 
,, fig. 44. Reticulated vessel of fig. 43, magnified 280 diameters. 
„ fig. 45. Transverse section of a detached vascular axis, magnified 20 
diameters. 
,, fig. 46. Part of the bark of a transverse section into which the two irre- 
gularly formed vascular bundles (to", to") have entered on their 
way outwards towards one or two secondary petioles, magnified 
20 diameters. 
„ fig. 47. Portion of a transverse section of the same specimen as fig. 46, 
but made a little higher up in the petiole, and with the vascular 
bundles (to", to") assuming a cylindrical form, magnified 20 
diameters. 
Plate LVIII. fig. 48. Part of the bark of a section of the same specimen, but made 
yet higher up, and with one of the vascular bundles apparently 
becoming abortive, magnified 20 diameters. 
Rachiopteris Uhractiensis. 
,, fig. 49. Transverse section of a petiole, magnified 20 diameters. 
„ fig. 50. Longitudinal section of fig. 49, magnified 20 diameters. 
Anaclioropteris JDecaisnii. 
,, fig. 51. Transverse section of the vascular axis of a stem apparently 
identical with the Anaclioropteris JDecaisnii of Renault. 
The letters of reference employed in the Plates correspond with those employed in 
the previous memoirs, except in the case of one or two. 
a. Central vascular axis. h. Middle cortical layer. 
g. Inner cortical layer. Jc. Outer cortical layer and its appendages. 
x. Ultimate subdivisions of the vascular bundles supplying branches of the rachis. 
