ATLAS OF FERTILIZATION. 



PLATE X. 



TWO-CELL STAGE DURING THE PAUSE, AFTER FISSION OF THE ASTERS (P. 31). 



38. 

 PREPARATION FOR THE SECOND CLEAVAGE IP. 31). 



/ 



^ui»v 



THE FOURTH CLEAVAGE IN PROGRESS SHOWING THE 

 MICROMERE-SPINDLES (P. 32). 



40. 

 BLASTULA. SIXTEEN-CELL STAGE IN SECTION (P. 32). 



