PLATE I. 



Fig. I. Median section of a young carpel of Aglaonenia commiitatuni. x about 25. 

 Fig. 2. Young ovule of A. conivnitatuvi, showing the young embryo-sac {e.s.) 



and the two integuments, x 90. 

 Fig. 3. YoMVi^osvX^ Qi A. VI odestum, x 90. 

 Fig. 4. Nucellus of an o\'ule of A. modestu;n of about the same age as that 



shown in fig. 3. x 250. e.s., embryo-sac. 

 Fig. 5. Nucellus of the same species, showing a division of the primary sporo- 



genous cell. 

 Fig. 6. Young ovule of ^. simplex. x 50. The embryo-sac (^..r.) contains two 



nuclei. 

 Fig. 7. The nucellus of the ovule shown in fig. 5. x 250. 

 Fig. 8. Cross-section of an embr)'o-sac of A. simplex, containing two nuclei 



placed near the middle of the sac. x 250. 

 Fig. 9. Two longitudinal sections of an embryo-sac of A. covimjiiatiim, with two 



nuclei, placed at opposite poles of the sac. x 250. 



