96 
EXPLANATION OF PLATE 56“. 
Fig. 9. Vertical section of the dome-shaped trunk of 
Stigmaria, shewing the relative position of the 
branches. (Lindley and Hutton.) 
Fig. 10. Restored portion of a branch of Stigmaria, 
shewing the manner in which the long cylindrical 
leaves proceeded from the tubercles around its sur- 
face to the length of many feet. In front, extend- 
ing from a. to b. is seen the depression adjacent to 
the internal eccentric woody axis a. From b. to c. 
this axis is laid bare by the removal of a portion of 
the sandstone. This part of the axis is drawn from 
a specimen in the Oxford Museum. Scale one- 
seventh. (Original.) 
Fig. 11. Fragment of a branch of Stigmaria, shewing 
the character of the Tubercles, which formed arti- 
culations with the bases of the leaves. The enlarge- 
ment of the leaf towards its base (a) seems to have 
been calculated to strengthen this part, and to afford 
space for the ailiculating socket. This socket 
formed, with the spherical tubercle, an universal ball 
and socket joint, admitting of motion in every di- 
rection to a long cylindrical leaf floating in water. 
Scale one-half. (Sternberg.) 
Plate 56“. V. 1. p. 483 et seq. 
Appearances presented by longitudinal and transverse 
sections of recent and fossil Coniferous woods, cut into 
thin slices, and magnified 400 times. (Nicol.) 
Fig. 1. Longitudinal Section of Pinus Strobus, cut pa- 
rallel to a medullary ray. 
Fig. 2. Transverse Section of the same. 
a. a. Portions of concentric annual layers. 
Fig. 3. Longitudinal Section of Araucaria Cunninghami. 
Fig. 4. Transverse Section of the same. 
