OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
527 
in the bark through which vessels passed to the bracts and sporangio- 
phores. e. Sporangia. Enlarged 14 diameters. 
Fig. 14. Transverse section through a sterile bractigerous disk of a C'alamostachys 
Binneyana. a. Vascular axis. b. Cortical layer of the axis. c. Elon¬ 
gated cells passing horizontally outwards to the sterile bracts. 
c. Parenchyma of the bractigerous disk. e. Sporangia, f Transverse 
sections of the apices of the bracts of the next inferior sterile verticil. 
g. Tips of the next inferior sterile bracts. Enlarged 16 diameters. 
Fig. 15. Transverse section of Calamo stachys Binneyana made in the plane of a 
verticil of the fertile bracts, and with the entire cortical layer preserved. 
a. Central vascular axis. b. Innermost cells of the cortex, b'. Middle 
and outermost parenchyma of the same. cl. Bases of sporangiophores. 
cl". Peltate extremity of a sporangiophore. e. Sporangia containing 
spores. Enlarged 22 diameters. 
PLATE 16. 
Fig. 16. Transverse section of the vascular axis of a strobilus of Calamostachys 
Binneyana (?). a. Vascular axis, b, b. Radially disposed additions 
to the central vascular bundle, disposed in three radiating groups, 
c. Middle cortical layer. Enlarged 46 diameters. 
PLATE 15. 
Fig. 17. A mother-cell with three daughter-cells (spores?) from a sporangium of 
Calamostachys Binneyana. Enlarged 405 diameters. 
PLATE 16. 
Fig. 18. A sporangium of Calamostachys Binneyana filled with parenchyma. 
Enlarged 162 diameters. 
Ferns. 
Fig. 19. Transverse section of a stem or petiole of Rachiopteris insignis. a. Outer 
cortex, b. Middle cortex, c. Inner layer of cortical cells. Enlarged 15 
diameters. 
Fig. 20. The central portion of fig. 19, enlarged 62 diameters, b. Middle cortex. 
c. Inner cortex. d. Cellular bundle-sheatli with a line of dark-coloured 
cells, h. e, f. Large and small peripheral vessels, the former filled with 
tylose cells, g. Cells enclosed within a loop of the vascular bundle. 
Enlarged 46 diameters. 
3 Y 2 
