PLATE 11 



EXPLANATION OF FIGURES 



58 to 63. Stenotomus chrysops 9 X Ctenolabrus adspersus cf . 



58 Metaphase of first cleavage in two sections. In the right-hand section 

 the chromosomes are massed together so that single elements cannot be dis- 

 tinguished. 



59 Anaphase of the first cleavage in three sections. The individual chromatin 

 is situated on one side of the spindle and appears in the left-hand section of this 

 series. The divided elements retain their characteristic form. 



60 Anaphase of the first cleavage in two sections. A great deal of undivided 

 chromatin is present at the equator of the spindle. 



61 Same as 60. Only one section drawn. 



62 Same as 60. Only one section drawn. 



63 A section through an egg in the telephase of the first cleavage. Some 

 chromosomal vesicles are still near the plane of cleavage. The section is oblique 

 to the axis of the spindle and does not contain the main portions of the reforming 

 daughter nuclei. 



284 



