and on the Structure of Hydnora africana. 237 



Fig. 2, which is the portion of the Hmb removed from fig. 1 : — natural size. 



Fig. 3. The upper half of one of the styles of the disc, with its terminating hairs : — magni- 

 fied 10 diameters. 



Fig. 4. A portion of fig. 3, somewhat more highly magnified (20 diameters), vertically 

 divided. 



Figs. 5, 6 & 7. Some of the hairs still more highly magnified, which, according to Mr. Bauer, 

 have a secreting surface seen in fig. 7, and which in figs. 5 and 6 is covered with 

 the secretion, consisting of spherical particles enveloped in mucus at fig. 8:^ 

 magnified 100 diameters (but see observations respecting them in page 225). 



Figs. 9 & 10. Longitudinal and transverse sections of a style : — magnified 50 diameters. 



Fig. 1 1 . A transverse section of half the ovarium, to show the numerous irregularly rami- 

 fied cavities, and the arrangement of vascular cords belonging to the bracteae and 

 calyx : — natural size. 



Fig. 12. A small portion of the ovarium, with the ovula covering the surface of the cavities, 

 and the vascular lines passing through the axes of the parietes : — magnified 20 

 diameters. 



Figs. 13 — 18. Ovula in various stages (the earliest observed are not represented) : — magnified 

 100 diameters. 



Tab. XXIV. 



Fig. 1. A ripe pericarpium, of the natural size, the calyx, bracteae and apex of the column 



being deciduous. 

 Fig. 2. The same divided vertically, and showing the thickness of the densely-fleshy and 



deeply-furrowed covering, and also that the whole of the ovarial cavity is above 



the insertion of bracteae and calyx. 



Tab. XXV. 



Fig. 1. A small portion of the wall of two adjoining cavities, the surfaces covered with 

 numerous seeds, all of equal size : — magnified 20 diameters. 



Fig. 2. A seed with its funiculus, of which the lower erect portion is filiform, the recurved 

 upper half being of the same texture, colour and surface with the seed, which it 

 somewhat exceeds in thickness : — magnified 100 diameters. 



Fig. 3. The same divided longitudinally, to show the structure of the seed (according to 

 Mr. Bauer), and that the enlarged apex of the funiculus is solid : — magnified 100 

 diameters. 



Fig. 4. The nucleus of the seed taken out of its thick nut-like outer covering : — magnified 

 100 diameters. 



2 I 2 



