﻿Contr. toward the Embryol. and Anat. of Pol. pallipes (Hymenopt.). 153 



Explanation of Plates X and XI. 



AU figures drawn with a camera-lucida. 



Fig. 1. Sagittal section through a young egg showing a few nuclei near 

 the anterior pole. Vergr. 62. 



In this and the five following figures, the resting nuclei are drawn with a 

 circle, the dividing nuclei with a cross. 



Fig. 2. A later stage. Vergr. 62. 



Fig. 3. A still later stage, the zone of cleavage nuclei is beginning to 

 show plainly. Vergr. 62. 



Fig. 4. Sagittal section through an egg after the cleavage nuclei have 

 wandered well towards the posterior pole. Vergr. 62. 



Fig. 5. Tansverse section through an egg at a little later stage. The 

 nuclei are all resting, and, in the drawing, have been combined from two 

 neighboring sections. Vergr. 62. 



Fig. 6. Longitudinal section through an older egg; the difference in Posi- 

 tion between the cleavage and the yolk nuclei is very marked. Vergr. 62. 



Fig. 7. Longitudinal section of an egg in which the cleavage nuclei have 

 entered the Keimhautblastem. It will be noticed that at the poles the undulating 

 outline has appeared. Below and to the right will be noticed a place where 

 the nuclei have not entirely entered into the Keimhautblastem. Vergr. 62. 



Fig. 8. Resting nucleus, from an egg about as far developed as Fig. 2. 

 Centrosome and archoplasm are seen. Vergr. 800. 



Fig. 9. Resting yolk nucleus, from an egg in which the cleavage nuclei 

 have just entered the Keimhautblastem. Archoplasm with astral fibres. Vergr. 800. 



Fig. 10. Resting yolk nucleus, from an egg in which the cleavage nuclei 

 have entered the Keimhautblastem, but blastoderm cells not yet formed. Vergr. 800. 



Fig. 11. Showing connections between the cytoplasmic masses surrounding 

 the nuclei; one binucleate. Vergr. 800. 



Fig. 12. Showing connections of three such masses. Vergr. 500. 



Fig. 13. Dividing nucleus, from an egg at a stage between Figs. 1 and 2. 

 Vergr. 800. 



Fig. 14. Slightly later stage in division of a yolk nucleus. From an egg 

 in about the same stage as Fig. 7. Vergr. 800. 



Fig. 15. Dividing nucleus, from same egg as Fig. 13. Vergr. 800. 



Figs. 16, 17, 18 and 19. Dividing yolk nuclei, from an egg in which the 

 cleavage nuclei have all reached the Keimhautblastem. Figs. 17 and 19 show 

 peculiar thickenings on connecting fibres. Vergr. 800. 



Figs. 20 and 21. Dividing yolk nuclei, from an egg slightly younger than 

 preceding. Both show the peculiar bodies surrounded by the connecting fibres. 

 Vergr. 800. 



Fig. 22. Dividing nucleus, from a late pre-blastodermic stage. Vergr. 800. 



Fig. 23. Dividing nucleus, the earliest stage in which the peculiar large 

 bodies seen in Figs. 20 and 21 were noticed. Here they are outside of the 

 connecting fibres. Vergr. 800. 



Fig. 24 and 25. Nuclei showing division nearly completed. From a late 

 pre-blastodermic stage. Vergr. 800. 



Fig. 26. Cleavage nucleus near the Keimhautblastem, which is to the right. 

 The line to the right of this and following figures represents the egg mem- 

 branes. Vergr. 800. 



