PLATE 2 



EXPLANATION OF FIGURES 



9 Fundulus heteroclitus 9 X Menidia menidia notata cf . First-cleavage 

 anaphase. A few of the Fundulus rods have been displaced by the knife. Only- 

 one section drawn. 



10 Third-cleavage anaphase of the same cross. Many chromosomes omitted. 

 No lagging. 



11, a and b Fundulus heteroclitus 9 X Stenotomus chrysops d'. Two sec- 

 tions of an anaphase of second cleavage. All of the chromosomes are drawn. 

 There are forty-six at either pole. Those in a have been spread laterally in 

 drawing. 



12, a and b Second-cleavage spindle of the same cross. No lagging. Some 

 chromosomes omitted in drawing. 



13, a and b Ctenolabrus adspersus 9 X Prionotus carolinus cf . Two sec- 

 tions of an early anaphase of the third cleavage. The daughter halves of divid- 

 ing chromosomes could be easily identified not only for those drawn, but in the 

 case of those omitted from the drawing. 



14 A later anaphase of the same cross. Third cleavage. No lagging. 



15 Same as 14. 



16 Prionotus carolinus 9 X Ctenolabrus adspersus cf. Second cleavage. 

 No lagging. 



17 Same cross. Later anaphase of second cleavage. Normal mitosis. 



418 



