Kofoid. — Development of Liiuax. 



PLATE II. 



All figures magnified 490 diameters. 



Fig. 15. Two-cell stage from animal pole. Spindles of the third generation pres- 

 ent. No cleavage cavity. Deeper ends of the spindles (asters of B 

 and D) shown by lighter lines. 



Fig. 16. Four-cell stage from the animal pole. Second cleavage furrow almost 

 completed. Cleavage cavity and lenticular spaces present. 



Fig. 17. Four-cell stage from the animal pole. Cleavage cavity present. Spindles 

 of the fourth generation. 



Fig. 18. Same egg from the anterior end. 



Fig. 19. Eight-cell stage from the animal pole, composed of the two quartets of 

 the fourth generation, a 4-1 -c/ 4-1 and a 4>2 -c? 4,2 . Third cleavage 

 plane just completed. Astroccels present. 



