AN rNDESCRIBED FOSSIL FRUIT. 591 



EXPLANATION OF THE PLATES OP TRIPLOSPORITE. 



Tab. U (XXIII). 

 The figures A, B, 0, and D are of the natural size. 



Pig. A. A portion of the surface of the Strobilus, showing the liexagonal 

 areolae. 



Pigs. B & C. Transverse sections, exhibiting different appearances of the 

 bractese and sporangia. 



Pig. D. A vertical section of fig. A. 



The remaining figures, E, P, G and H, are all more or less magnified. 



Pig. E. A transverse section of the axis. 



Pig. P. A more highly magnified drawing of a portion of fig. B, to show the 

 arrangement and proportion of the vascular and cellular tissues. 



Pig. G. A horizontal section of a sporangium, made probably near its origin. 

 Pig. H. A portion of the outer wall of a sporangium or bractea. 



Tab. 35 (XXIV). 

 All the figures magnified. 



Pig. A. A vertical section of the axis, near, but not exactly in the centre, 

 showing the ramifications of the central cord of the axis going to the circum- 

 ference of the axis, and connected or supported by a loose cellular tissue at a a. 



Fig. B. A small portion of the ax.is, from which proceeds a bractea out 

 vertically through its centre, showing its vascular cord, and bearing on its 

 lower and horizontal half a vertical section of an adnate sporangium, of which 

 the base is cellular, rising irregularly and without spores, — probably a rare 

 occurrence. 



Pig. 0. A small portion of the axis, to show the scalariform vessels with [475 

 the slightly elongated surrounding cells. 



Pig. D. A similar portion, from the central axis of the bractea of fig. B. 



Pig. E. A similar portion, from the line of union between the bractea and 

 sporangium of fig. B. 



Pig. P. A small portion of a sporangium, sufficiently magnified to show the 

 arrangement and composition of sporules. 



Pig. G. Several sporules, both in their compound and simple state, still more 

 highly magnified, with the minute granular matter which usually accompanies 

 Ihem. 



