258 MR. MIERS ON THE SEED OF CLUSIACE^E. 



Fig. 16. The same, seen laterally. 



Fig. 17. The embryo seen on its ventral face, showing the minute plumule in the umbilicated hollow- 

 near its summit. 



Fig. 18. A transverse section of the same, marking the central neorhiza. 



Fig. 19. A longitudinal section of the same, with the axile neorhiza, and numerous viscous ducts distri- 

 buted through the mass of the immense epirhizal radicle : — all natural size. 



Fig. 20. A seed of Tovomita rufescens, showing on its ventral face the attachment of the arillus to the 

 axile placenta of the fruit. 



Fig. 21. The same, displaying the manner in which the free margins of the arillus overlap each other. 



Fig. 22. The same, with the arillus removed, seen laterally. 



Fig. 23. Embryo, with the testa removed. 



Fig. 24. The same, cut longitudinally, to show the plumule and the neorhiza in the axis of an immense 

 epirhizal radicle. 



Fig. 25. Portion of the summit of the embryo, showing the minute plumule in the hollow of its apex : — 

 all natural size. 



Fig. 26. The plumule removed, showing the two very minute external cotyledons. 



Fig. 27. A portion of the base of the embryo, showing the radicating point of the neorhiza: — both much 

 magnified. 



Fig. 28. A seed of Commirhwa mecocarpa, seen laterally, enveloped in its fleshy arillus. 



Fig. 29. The same, exhibiting on its dorsal face the manner in which the free margins of the arillus over- 

 lap each other. 



Fig. 30. The arillus removed and spread open, denoting the cicatrix where it is attached to the hilum. 



Fig. 31. The testa seen laterally, showing the hilum and branching nervures of the imbedded raphe. 



Fig. 32. The embryo, with the testa removed, seen on its ventral face, with its apical umbilicus. 



Fig. 33. Longitudinal section of the same, cut through the dorsal and ventral faces, showing the immense 

 epirhizal radicle enclosing the axile neorhiza, and its radicating point. 



Fig. 34. Germination of the embryo of Xanthochymus, after Roxburgh, exhibiting the prolongation of the 

 plumule, with its basal cotyledons, and showing one radicating shoot springing from the neck 

 of the protruding neorhiza, and another from the basal point ; half of the radicle is here removed 

 to display the whole neorhiza, and the mode of its prolongation both upwards and downwards : 

 the radicle thus appears to exert no other function than to afford nutriment to the growing 

 neorhiza : — all natural size. 



