OF LOWER GREENLAND PLAXT8. 307 



V. 5217 b, c. Smaller sections similar to the above, but still 



more imperfect. 



" Potton Sands," Lower Greensand ; near Leigh ton Buzzard. 

 Transferred from the Botanical Dept., 1898. 



V. 5219. A short length, 8 cm. long, and a second small slice 

 from which a section has been cut, of the pith and 

 wood only. The inorganic pattern made by the con- 

 cretionary nature of the mineral is so similar to that 

 in V. 5217 that there is little doubt that they are 

 from the same trunk. 



V. 5219 a. Figured, text-fig. 96. Transverse section of the 

 above, which though rather broken and opaque shows 

 the tracheids in the wood-rings quite clearly in places 

 (as figured in text-fig. 96). The soft cells of the pith 

 are practically obliterated, but round patches among 

 them seem to indicate the presence of gum-canals. 



V. 5219 b, c. Radial longitudinal sections of the above, in 

 which the pitting of the tracheid-walls can just be 

 made out here and there, and shows that they 

 apparently have round bordered pits in one or two 

 rows (slide 6). 



V. 5219 d, e, f. Tangential longitudinal sections of the above 

 passing through the wood-zones with their broad 

 medullary rays. The cells are poorly preserved for 

 the most part, but their nature can be made out. 

 <; Potton Sands,*' Lower Greensand ; near Leighton Buzzard. 

 Transferred from the Botanical Dept., 1898. 



V. 9384. A wedge, 12 cm. long, of part of the pith and wood- 

 zones, evidently of the same trunk as the above. The 

 cut surface of one end shows just the same pattern in 

 the matrix of the pith. On one side of the specimen 

 a cast of the surface of the pith shows the lenticular 

 ridges very characteristically. " Potton Sands," Lower 

 Ureensand ; Leighton Buzzard. 



Transferred from the Botanical Dept.. 1903. 



