OF LOWER GREENSAND PLANTS. 105 



broad annual rings are apparent to the naked eye, as 

 is the slight crushing and distortion of the spring wood 

 in places. The specimen is iron-stained, and is very 

 close and hard in texture, and the tissues are beauti- 

 fully petrified. 



V. 1440 a. Figured, PI. IV, figs. 1 & 2. Transverse section of a 

 part of the above, 3*5 x 4'5 cm. The well-developed, 

 very broad rings are clear, and also the numerous 

 rather broad uniseriate rays. Resin-canals are 

 present, both singly throughout the wood and in 

 tangential groups towards the outer region of the 

 growth- ring. 



V. 1440 b. Figured, text-fig. 23. Radial longitudinal section of 

 the above. In parts of this the character of the 

 medullary rays, with their interspersed bands of ray- 

 tracheids, shows up very clearly. The pitting both of 

 the ray-tracheids and of the parenchymatous cells can 

 be made out. 



V. 1440 C. Figured, text-fig. 24 and PL V, fig. 1. Tangential 

 longitudinal section of the above, part of which slopes 

 into a radial direction. In the tangential sections of 

 the rays the alternation of the ray-tracheids and the 

 parenchyma-cells shows very well, as is illustrated in 

 the text-figure. In many cases multiseriate rays 

 show the cut ends of horizontally running resin- 

 canals. 

 Lower Greeusand ; Ightham, Kent. 



Presented by John Hale, Esq., 1886. 



Pityoxylon Benstedi, sp. nov. 

 [Plates V, VI, VII ; text- figs. 26, 27.] 



Diagnosis. Wood with the characters of Pityoxylon, Kraus. 

 The type is a small branch, about 6 cm. in diameter, and with 

 a large circular pith 3-5 mm. in diameter with numerous 

 primary bundles round it. Pith without stone-cells. Growth- 

 rings well marked. Tracheids small, largest spring wood 

 30-35 fj. in diameter, rounded at the corners. In radial walls, 



