PLATE 9. 
Fig. 71. Left side of the egg shown in Figures 69-74, Ninety-four cells. 
Fig. 72. Dorsal view of the egg represented in Figures 60-74. The small 
cells in the centre, at the point of meeting of the four quadrants, are 
ate — 716, 
Fig. 73. Ventral end of the same egg, showing the crowding together of the 
cells of the quadrants A, B, and C in this region. 
Fig. 74. Posterior view of the same egg, showing spindles for the ninth cleavage 
in some of the cells of quadrant D, and the ninth cleavage completed 
in other cells of that quadrant. 
Fig. 75. Anterior surface of a later stage, containing about 120 cells. At the ven- 
tral end (lower part of the figure) the cells are much crowded and 
many of them are very small The vesicles immediately below the 
cells 58-15, «8:1, and 4914 are the small ventral produets of the cleav- 
age of a^ 5- c^ and a^ =, the spindles for which are shown in 
Figures 69 and 70, Plate 8. 
Figs. 76-79. Successive stages in which the ectoderm is conceived to have been 
removed from the right side, to show the entoderm cells. 
Fig. 76. Egg at the stage shown in Figure 75. A frontal section of this egg is 
given in Plate 10, Figure 81. 
Fig. 77. Slightly older stage than Figure 76, viewed in tlie same way. 
Fig. 78. Slightly older stage than Figure ‚77, showing the change in the position 
of the cells of the entoderm and of those at the animal pole. A view 
of this egg from the animal pole is shown in Plate 10, Figure 82. 
Fig. 79. Later stage than Figure 78. The entoderm cells have changed position 
still further, and are approaching cleavage. 
