OF THE RAPHE IN SEEDS. Ill 



EXPLANATION OF THE FIGURES. 



Tab. XIX. 



Fig. 1. Is a seed of Stemonurus polymorphu^ : — natural size. 



Fig. 2 & 3. The coriaceous endocarp deprived of its pulpy covering, seen on its dorsal face and on its 



side. 

 Fig. 4. The same on its ventral face, showing the channel in which is imbedded the cord formed of the 



axile placentary nourishing vessels. 

 Fig. 5. Is a section of fig. 3. magnified : — a. is a foramen in the summit of the channel through which the 

 raphe passes into the cell of the putamen ; b. the longitudinal channel in which the placentary 

 cord is imbedded, and which passes into it through a tubular passage leading from the base. 

 Fig. 6. The seed removed from fig. 5. seen on its edge : — a. is the free portion of the raphe by which the 

 seed is suspended ; it is a continuation of the axile placentary cord c ; 4. is the raphe imbedded 

 in the integument. 

 Fig. 7- The same viewed upon its dorsal face, showing the singular course of the raphe. 

 Fig. 8. The same observed from above : the same letters refer to the same points in the three last figures. 

 Fig. 9. The integument removed and spread out to show the form of the raphe more distinctly. 

 Fig. 10. The albumen. 



Fig. 11. A transverse section of the same, showing the cavity formed by the persistent embryo-sac. 

 Fig. 12. A longitudinal section of the same. 



Fig. 13. The persistent embryo-sac removed from the albumen with the embryo in its natural position. 

 Fig. 14. The embryo removed. 

 Fig. 15. Same still further magnified. 

 Fig. 16. Is a seed of Anona sylvatica : — natural size. 

 Fig. 17. The same seen sideways. 

 Fig. 18. The same magnified, showing the marginal expansion of the crustaceous covenng and its open 



cavity at the base. 

 Fig. 19. One side of the cell removed, to show the enclosed seed and the hollow chamber at the base. 

 Fig. 20. A transverse section of fig. 18, showing the raphe lying in a groove of the albumen along each 



side. 

 Fig. 21. The seed removed, showing the annular form of the raphe and its connexion with the ceiling of 

 the basal chamber of the shell : from the centre of the latter a raucronate point, as long as the 

 hollow chamber, projects, and at each angle two threads are observed in the same space. 

 Fig. 22. The same viewed edgeways, showing the peripherical form of the raphe. 

 Fig. 23. The raphe separated and remaining attached to the ceiling of the basal chamber. 

 Fig. 24. A longitudinal section of the albumen with the enclosed embryo. 

 Fig. 25. The basal portion of the same more highly magnified, showing the embryo, and the hollow in the 



base of the albumen caused by the impression of the basal chamber. 

 Fig. 26 & 27. The embryo seen in front and sideways. 

 Fig. 28. A fruit of Citrosma Aposyce, Mart. 

 Fig. 29. A seed capped by a glandular enlargement of the style. 

 Fig. 30. The same deprived of its cap. 



Fig. 31. The same with its fleshy epiderm removed, showing an echinate nut. 



Fig. 32 & 33. The same magnified, seen in front and sideways, showing the flat expansion of its border. 

 Fig. 34. A longitudinal section of the same, showing its hollow hilum and the enclosed seed. 



