3 1 2 ALLEN. 



EXPLANATION OF PI, ATE II. 



FIG. i x 127 ; FIG. 2 x nS; FIGS. 3-8, 10-15 x 7^5; Fio. 9 x 495. 



FIG. i. Growth of ovum (e) by absorption of primitive cells (J>). 



FIG. 2. Showing the number of growing primitive egg cells to be found in a 

 single gonophore. 



FIGS. 3, 4. Primitive egg cells in early stage of development showing pseudo- 

 podia (s) ; nucleus (if) ; oil drops (a) ; chromatin fibers (<-). 



FIGS. 5-8. Later stages showing the disappearance of the nucleus of the 

 growing egg. d, nucleus ; />, nucleolus ; o, oil drops. 



FIG. 9. Vacuole (v) in segmenting egg showing nuclei of absorbed cells (a] 

 in various stages of disintegration. 



FIGS. 10-15. Retrograding nuclei of absorbed cells. Nucleolus (r) ; assembled 

 chromatin fibers (i). In Fig. 15 a portion of the nucleus has been absorbed; the 

 smaller part is in the process of division, the nucleolus having already divided. 



