706 MR. W. CARRUTHERS ON FOSSIL CYCADEAN STEMS 



Plate LVII. 



Kg. 1. Longitudinal section of Bennettites Saocbyanus, Carr., showing the pith, wood cylinder, bark, bases 



of the leaves, and one fruit-cavity, from a specimen from Brook Point, in the British Museum. 



Fig. 2. The external appearance of the broad surface of the same specimen. The bases of the petioles 



form cavities, the network of ridges being composed of the dense ramentum. A cavity formed 

 by a fruit is seen near the centre of the specimen. 



Kg, 3. Transverse section of B. Saxbyanus, Carr., showing the pith, the woody cylinder broken by the 



meshes through which the vascular bundles to the petioles pass, the pith everywhere penetrated 

 by the vascular bundles, and the rubbed bases of the petioles : from a specimen from Brook Point 



in the British Museum. 



surface the direction of the 



bundles from the wood through the pith to the petioles. 



^ 



of the vascular bundle at the base 



cylinder. 



Fig. f>. The form of the bundle as it leaves the woody cylinder. 

 1 g. 7. The bundle as it passes through the bark. 



brol 



Plate LVIII. 



Pi or 



with a longitudinal section of a fruiting branch. 



wood, bark, and 



gum 



Luccomb 



Rg. 2. Longitudinal section of the same, perpendicular to the line forming the base of fig. 1. The 



are 



bundles. Four fruit-bearing branch 



The upper central one is cut through 



the cushion which terminates the branch, and shows the whorls of leaves surrounding it. That 

 in the centre of the figure is cut through the vascular cords ; while those on the right and left 

 of the specimen are cut through the upper cellular and seed-bearing portion of the fruit. 



rig. . . A portion of the last section, the size of nature, containing two of the fruit-bearing branches. 



ng. l. A portion of fig. 1, showing the wood cylinder and two vascular bundles pairing off to the petioles. 



* o. ine portion of fig. 1 showing the longitudinal section of the fruit, the size of nature. The leaves 



at me side of the fruit are in longitudinal section, and those at the apex in transverse, being 

 imbricated over the fruit 



Plate LIX. Fruits of B. Gibsonianus. Car 



* Lm£Z?-~Z S ° meThi;t 0UiqUe SeCti ° nS t0Waris the sid « °f the fruit. The investing 



es arc seen ,„ transverse section at the base. The dark , M « with™ tf» ■««. presents 



. . ' , ~ "' ™" " U1[ > •"'luch is largely d< 



structure along the sides and at the base of the fruit. 



but is also a very distinct 



parts of the structure. 



showing 



ngs. <* « o. transverse sections tho fi„ * 



fruit* ' St near the a P ex and the second towards the middle of the 



Fi£. 6. Section of a voim^ seed showi 



tatting the'fleshy pericaro ,„,f T P P r0,0I, S e(1 iat ° * ^tyliforra tubular process, pene- 



the adprcsscl taTX£ "T^ ™ * ""^ " * darted *■"»*' disk ' °°* "' 

 Fig. 7. Section of a seed, showi 12 ZT" ^^ «"*** this disk. 



entrance of the vascular "cord M y f ^ . "**' and «* opening at the base for the 



