PLATE 4 



EXPLANATION OF FIGURES 



20 to 23 Fumlulus heteroclitus 9 X Ctenolabrus adspersus d'. 



20 and 21 Both metaphase spindles of a two-celled egg shown in their cor- 

 rect relative positions. The elimination of chromosomes is toward the first 

 cleavage plane in both cases. 



22 and 23 Metaphase spindles from another egg of the same lot as that shown 

 in figures 20 and 21. No elimination of chromatin from the spindle was seen in 

 either cell. The convexity of the spindle is toward the first cleavage plane. 



