and on the Structure of Hydnora africana. 239 



Fig. 7- Transverse section of the flower, to show the form and surface of the stigma (of 

 which the three primary divisions are opposite to the lobes of the columna sta- 

 minea) : — magnified in the same degree with fig. 1. 



Fig. 8. A portion of the stigma, which shows its composition. 



Fig. 9. A transverse section about the middle of the same: — both magnified somewhat 

 more than figs, 2 and 3. 



Fig. 10. A vertical section of the stigma, showing that the divisions of its surface extend 

 quite through to the cavity of the ovarium, separating it into an equal number of 

 lamelte, from the inner terminations of which the placentae are pendulous : — more 

 highly magnified than the preceding figures. 



Fig. 11. A small portion of the same, still more highly magnified. 



Fig. 12. A transverse section, more highly magnified than fig. 11, with its densely crowded 

 ovula arising from every part of its surface. 



Fig. 13. Three ovula more highly magnified than fig. 12, to show the pedicellus or atte- 

 nuated base and depressed or perforated apex. 



Tab. XXIX. 



A ripe fruit (fig. 1.), with the stock (the root of the supposed Euphorbia, fig. 3.) and 

 the decumbent angular branched stems of the parasite, from the thickened trunk 

 of which the ripe fruit originates at fig. 2, and from a branch of which a very 

 young flower-bud proceeds : — natural size. 



Tab. XXX. 



Fig. 1. The same ripe fruit vertically divided, with the prostrate thickened stem of the 

 parasite and the root of the supposed Euphorbia, whose woody fibres and vessels 

 appear to penetrate deeply into the substance of the thickened stem : — natural 

 size. 



Fig. 2. A portion of the fruit transversely divided. 



Fig. 3. A transverse section of one of the placentae, with the ripe seeds : — slightly mag- 

 nified. 



Fig. 4. Two seeds, more highly magnified than fig. 3. 



Fig. 5. A seed, magnified in the same degree as fig. 4, and vertically divided, which exhibits 

 the albumen more distinctly radiating than I have ever found it. 



Fig. 6. A seed deprived of its outer coat. 



Fig. 7- The same transversely divided, which, as well as fig. 5, shows the central globular 

 embryo. 



