212 



Wm. S. Marshall, 



Fig. 57. Ovaiy 1. An ovarian tubule from a wasp six or eight hours 

 after it has left its cell. Syn, position of the synapsis nuclei. The nurse-cells 

 of the oldest Chamber only, are dravm in, all cells distal to this are oöcytes. 

 X 100. 



Fig. 58. Nucleus of one of the epithelial cells which are found in the 

 nurse Chambers; from position 58 in preceding figure. x 1600. 



Fig. 59. Three follicle cells from oldest egg Chamber, position 59 in 

 figure 57. The three nuclei are not from adjacent cells but show a resting 

 nucleus, one preparatory to division and one in mitosis. x, designates that 

 surface of the cells which lies nearest to the oöcyte. x 850. 



Figs. 60, 61 and 62. Three nurse-cell nuclei from ovary I, at positions 

 represented by corresponding numbers in figure 57. x 1600. 



Fig. 63. Half of a nurse-cell from proximal part of the oldest nurse 

 Chamber, x 850. 



Fig. 64. Three oöcyte nuclei a, b and c, and one nurse-cell nucleus, d, from 

 place 64 in ovary I, just distal to the synapsis nuclei. The four nuclei are not 

 so close together as in the drawing but were found within a very short distance 

 of each other. x 1600. 



Fig. 65. Oöcyte nucleus in synapsis, from position Sy^i, in ovary I. 

 Between this and an adjacent oöcyte is a chromatin ring; enough cytoplasm 

 has been drawn to show the darkened portion within the ring, x 1600. 



Fig. 66. Oöcyte nucleus just proximal to those in synapsis. x 1600. 



Fig. 67. Part of oöcyte in ovary I, showing the nucleus and the small 

 nuclear-like bodies. x 850. 



Fig. 68. Nucleus and three of the small bodies from the oldest oöcyte in 

 ovary I. x 850. 



Fig. 69. Ovary J. Part of an ovarian tubule, from the undifferentiate^^ 

 cells to part where the cells are grouping preparatory to Chamber formation, 

 from an older ovary than the last, x 400. 



Fig. 70. Four dividing cells from position 70 in ovary J. X 1600. 



Fig. 71. Two oöcytes just distal to the synapsis nuclei. In one the 

 contraction of the Strands towards one side of the nucleus, has begun. Just 

 enough cytoplasm has been drawn to show the darkened part in the chromatin 

 ring. Ovary J. x 1600. 



Fig. 72. Oöcyte nucleus just proximal to those in synapsis. Ovary J. 

 X 1600. 



Fig. 73. Two oöcytes, a, and one nurse-cell, b, further down the same 

 tubule. X 1600. 



Fig. 74. Surface view of oöcyte nucleus. Ovary J. x 1600. 



Fig. 75. Oöcyte nucleus in which the beaded threads have commenced to 

 break up; from position 75 in ovary J. X 1600. 



Fig. 76. Oöcyte nucleus showing nucleolus and the irregulär masses 

 containing the chromatin granules. X 1600. 



Fig. 77. Oöcyte nucleus from position 77 in ovary J. x 1600. 



Fig. 78. Oöcyte with accompaning nurse-cells at beginning of Chamber 

 formation. Among the nurse-cells are a number of epithelial; some of these 

 are also around the oöcyte. x 500. 



Fig. 79. Chamber a little older than the last. The epithelial cells have 

 formed a narrow girdle around the oöcyte. X 500. 



Fig- 80. A still older Chamber, x 500. 



