Jeknimgs. — Asplanchna. 



PLATE 7. 



Fig. 53. Quadrant Dat a stage a little older than that shown in Plate 6, Figure 46. 

 The rotation of the asters in the cell d'^-^ is in progress. Thirty-two 

 cells. 

 Fig. 54. Later stage than Figure 53, showing the final dorso-ventral direction of 

 the spindle in d^-^. A section of this egg is represented in Plate 6, 

 Figure 48. Thirty-two cells. 

 Anterior surface of 49-cell stage, showing the sixth cleavage in progress. 

 Ventral end of the egg seen in Figure 55, showing the large cell d'-^ 



nearly enclosed by the other cells. 

 The sixth cleavage in quadrant D. 38-cell stage. 



Completion of the sixth and beginning of the seventh cleavage in quad- 

 rant D. Same egg as that shown in Figures 55 and 56. 

 Dorsal view of the egg seen in Figure 57. 



Dorsal view of a stage later than the preceding, representing the same 

 egg as that shown in Figure 58. Sixth cleavage nearly completed. 

 Fig. 61. Anterior view, showing the completion of the sixth cleavage in the quad- 

 rants A and B in ail the cells except a^'°. Sixty-nine cells. 



