16 



vermiform maie nucleus in the act of entering 

 the egg. Mag. X 1000. 

 Fig. 10. Mourera fluviatilis. Top of the nucellus with 

 degenerating epidermiscells and fertilized egg. 

 The nucleus of the egg shows its origin from 

 two nuclei. Mag. x 1000. 



Fig. 11. Mourera fluviatilis. Fertilised ovule with fourcelled 

 pro-embryo, which Is pushed forward into the 

 pseudo-enbryo-sac. The walls of the inner row of 

 cells of the inner integument somewhat thicke- 

 ned. Mag. X 225. 



Fig. 12 and 13. Oenone Richardiana. Two transverse sec- 

 tions of the same ovule. In the lower one (fig. 

 12) the pseudo-embryo-sac is visible in the middle 

 with 6 nuclei and is surrounded by the two cell- 

 layers of the inner integument. In the upper one 

 (fig. 13) the part of the nucelliis in the endosto- 

 inium has been eut; hère the megaspore is sur- 

 rounded by one layerof epidermiscells. Mag. X 1000. 



Fig. 14. Apinagia species. Nucellus and inner integument 

 of an ovule where the pseudo-embryo-sac has 

 formed (three of its nuclei are visible). The two 

 syner-gids with the egg and embryo-sac are to 

 be seen in the top of the nucellus. Mag. X 580. 



