504 ROBERT CHAMBERS, JR. 



13 Egg cleavage nearly completed. The nuclear body has separated into the 

 two daughter nuclei. Rays are absent in the equatorial region which is probably 

 in the sol state. The sphere-liquid extends over part of each daughter nucleus 

 like a cap. 



14 Hyaline area in Cerebratulus egg with the egg nucleus preparatory to the 

 formation of the first maturation figure. 



15 First maturation spindle with amphiaster. 



16 First maturation anaphase 'spindle' stretched by the needle in an attempt 

 to pull it away from the egg periphery. The peripheral aster and the egg surface 

 form a continuous gel thus anchoring the 'spindle.' 



17 First polar body almost completely extruded. The egg nucleus lies in a 

 clear area below the polar body. 



18 Interkinetic egg nucleus pushed out of its normal position into the granu- 

 lar cytoplasm. 



19 Granules in the cytoplasm receding from the dislocated egg nucleus so 

 that it is soon surrounded by a clear area again. The area originally occupied 

 by the. nucleus is being invaded by granules so that in time it cannot be distin- 

 guished from the general cytoplasm. 



20 Second polar body formed by the dislocated egg nucleus on the egg 

 periphery some distance from the first. 



