DESCRIPTION OF PLATES 



All drawings, except figure 12, were made at table level by the aid of a camera 

 lucida, using a Zeiss 1.5-mm. oil-immersion objective, and a compensating ocular 

 no. 4. This gave a magnification of 1250 diameters. Figure 12 was made slightly 

 above table level and its magnification was 1170 diameters. 



Plates 1 and 3 were then reduced to f their size, giving a final magnification 

 of 500 diameters. 



Plates 2 and 4 were reduced 5, making a final magnification of 625 diameters, 

 except for figure 12, which is 585 diameters. 



PLATE 1 



EXPLANATION OF FIGURES 



(All eggs illustrated on this plate are from the same series.) 



1 Unfertilized egg. Flemming without acetic, unstained. 



2 Twenty-five minutes after insemination. Flemming without acetic, 

 unstained. 



3 One hour and forty minutes after insemination. Flemming without 

 acetic, unstained. 



4 Unfertilized egg. Flemming without acetic, alizarin and crystal violet. 



5 Twenty-five minutes after insemination. Flemming without acetic, 

 alizarin and crystal violet. 



6 One hour after insemination. Flemming without acetic, alizarin and 

 crystal violet. 



