PLATE V. 



Ik'fo'é ucata. X 60. 



Fig. 63. ligg with three cuts, namely, tlic nucleated part was cut off from the left 

 half, which is found attached to the right portion, the '' head " was spht 

 lengthswise (it was at X X when operated upon) and a portion of cytoplasm 

 was cut off obliquely from the micromere region. 11.10 AM. 



Fig. 64. The same. 0.35 PM. 



Fig. 65- £^gg "\^'itii '^11 incision at the micromere region. 9 AM. 



Fig. 66. The same. Ectoplasmic thickening is very conspicuous over a prominence 

 to the left of the incision. 11.45 AM. 



Fig. 67- i^gg ^"»'ith an incision on the right side. 0.5 PM. 



Fig. 68. Til« same- O-SO PM. 



Fig. 69. Egg with an incision at the micromere region. 9.45 AM. 



Fig. 70- The same. Cleavage furrow has become continuous with the cut. 10.18 

 AM. 



Fig. 71- Egg with a vertical incision at the micromere region. 2.15 PM. 



Fig. 72- The same. " Head " has become irregular and a flow figure is seen. 



Fig. 73. The same. Cleavage furrow has fused and two new furrows have been 

 formed. 3.11 PM. (at 2.55 PM. two slight indentations were formed). 



Fig. 74. The same. 4.18 PM. 



Fig- 75. Egg with two incisions on both sides. 10.53 A^I. 



Fig. 76. The same. 11.28 AM. 



