168 ON THE OKGANISATION OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
Plate. 
Fig. 
• 
1 
Pages on whict 
references are 
made to tlie | 
figures. j 
3 
18 
Central portion of fig. 1 7 further enlarged ; a, fibro- 
vascular bundle; h, phloem; t*, inner cortex. 
X 400 . 
1 
162 
3 
19 
Central vascular axis of another transverse section like 
1 7, enlarged equally to fig. 18: a, vascular bundle; 
h, phloem ; c, cortical parenchyma. Cabinet number, 
1234. X 400 . 
162 
3 
20 
Transverse section of a triarch root, from Halifax : a, 
triarch vascular bundle ; h, phloem or procamhium ; 
c, position of the bundle-sheath ; d, cortex. Cabinet 
number, 1234. X 44 . 
i 
162 i 
3 
2] 
Central portion of fig. 20, further enlarged : a, vascular 
bundle; h, phloem; d, cortical cells. X 175 
162 ’ 
3 
22 
Obliquely transverse section of a root with a lacunar 
cortex, from Halifax : a, the vasculo-medullary axis 
with some vessels imbedded in procambial or phloem 
tissue ; 6, inner cortex with large, radiating, irregular 
lacunse; c, outer cortex. Cabinet number, 1350. 
X 45. 
163 
3 
23 
Transverse section of another lacunar root: a, medul¬ 
lary cells; 6, cylinder of tracheids; c, cycloidally- 
arranged endodermad cells ; d, numerous thin radia¬ 
ting cellular laminae, extending, when not ruptured, 
from the endoderm, c, to the external cortical 
parenchyma, f, and including numerous large 
lacunae, e. Cabinet number, 1892. X 7 . 
163 
