58 Pub. Puget Sound Biol. Sta. Vol. 2, No. 34 



PLATE 14 



For abbreviations see table of cell lineage. 



Fig. 11. Radial formation of spindles for third cleavage. 



Fig. 12. Formation of third cleavage spindles in dexiotropic spiral; 

 C and D preceding A and B. 



Fig. 13. Resting S-celled stage. 



Fig. 14. Similar stage as Fig. 13 seen from the side showing modi- 

 fication of contour of cells in increased compactness of egg. 



