474 Mr. Brown on an undescribed Fossil Fruit. 
different form: but the spores in composition, form, and apparently in size 
were identical. This specimen had then very recently been received from the 
Strasburg Museum, but nothing was known of its origin or history. 
May 5, 1851. 
EXPLANATION OF THE PLATES OF TRIPLOSPORITE. 
Tas. XXIII. 
The figures A, B, C, and D are of the natural size. 
Fig. A. A portion of the surface of the Strobilus, diig the hexagonal areolæ. 
Figs. B. & C. Transverse sections, exhibiting different appearances of the bracteæ and spo- 
rangia. 
Fig. D. A vertical section of fig. A. 
The remaining figures, E, F, G and H, are all more or less magnified. 
Fig. E. A transverse section of the axis. 
Fig. F. A more highly magnified drawing of a portion of fig. E, to show the arrangement 
and proportion of the vascular and cellular tissues. 
Fig. G. A horizontal section of a sporangium, made probably near its origin. 
Fig. H. A a of the outer wall of a sporangium or bractea. 
Tas. XXIV. 
All the figures — 
Fig. A. A vertical section of the axis, near, but-not exactly i in the centre, showing the rami- 
| fications of the central cord of the axis going to the circumference of the axis, and 
-connected or supported by a loose cellular tissue at aa. 
Fig. B. v small portion of the axis, from which proceeds a bractea cut vertically through 
dts 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. 
