Bancroft. — Distaplia occidentalia. 



PLATE 6. 



Fig. 47. Part of the wall of a corpus luteum from which the ovum has just passed 



out. 

 Fig. 48. Germinative vesicle just as it is beginning to shrink. From the same 



ovum as that in Fig. 28, measuring 173 X 150 ju. Keichert ^ imiuers., 



Zeiss 2 ; X 890. 

 Fig. 49. Germinative vesicle and yolk-clump in an ovum of 190 p. diameter. 



Keichert ^ immers., Zeiss 2 ; X 890. 

 Fig. 50. Germinative vesicle and central yolk bodies at a later stage. Ovum is 



254 jx in diameter. Zeiss ^ immers., 2 ; X 1300. 



Figs. 51-59. Nucleoli in various stages of development. The measurements are 



in fi. 



Dimensions of Dimensions of the 



the Ovum. Germinative Vesicle. 



Fig. 51. indistinct 15 X 11 



Fig. 52. 23 X 13 13 X 11 



Fig. 53. indistinct 13 X 10 



Fig. 54. 46 x 38 25 X 19 



Fig. 55. 43 X 34 22 X 18 



Fig. 56. 45 X 35 23 X 17 



Fig. 57. 191 X •? 33 X 25 



Fig. 58. 152 X 113 49 X 30 



Fig. 59. 207 X 190 32 X 22 



Figs. 60, 61. Two successive sections through the group of tetrads formed just 

 before the formation of the first polar cell. The ovum has just 

 reached the pouch. 



