PLATE 2 



EXPLANATION OF FIGURES 



(Figures 7 to 11 are from the same series.) 



7 Unfertilized egg. Picro-acetic, iron hematoxylin. 



8 Twenty minutes after insemination. Picro-acetic, iron hematoxylin. 



9 Fifty minutes after insemination. Picro-acetic, iron hematoxylin, 



10 One hour after insemination. Picro-acetic, iron hematoxylin. 



11 Three hours and one-half after insemination. Picro-acetic, iron hema- 

 toxylin. 



12 Onehour and ten minutes after insemination. Champy, iron hematoxylin 



