BIGELOW. Development of Lepas. 



PLATE 4. 



Figures drawn from transparent preparations of entire eggs. Vegetative pole 

 at the left in lateral views. 



Fig. 31. Egg viewed from animal pole. Late anaphase of second cleavage. 



Fig. 32. Four-cell stage. Nuclei in " resting " phase. Egg viewed from animal 

 pole. 



Fig. 33. Same egg viewed laterally. Yolk at vegetative pole of cell c? 3 . 



Fig. 34. Four-cell stage during third cleavage. Viewed from animal pole. 



Fig. 35. Same egg from vegetative pole. Oil spherules of the yolk near the 

 surface. 



Fig. 36. Same egg in lateral view. 



Fig. 37. Eight-cell stage from animal pole. All nuclei are in "resting" phase. 

 Second polar cell covered in by the meeting of a 4 ' 2 and c 4 ' 2 . 



Fig. 38. Same egg from vegetative pole. Oil spherules near lower surface of yolk- 

 cell. Cells of quadrant b (6 4 ' 1 , 6 4 - 2 ) stippled. 



