PLATE 2 
EXPLANATION OF FIGURES 
CUMINGIA AND CEREBRATULUS 
M Section of normal egg just laid. 
N Centrifuged egg, killed at once. 
O Centrifuged egg, killed at second polar body stage. 
P Centrifuged egg, at once, killed at segmentation-spindle stage. 
Q Centrifuged egg, same. 
R Centrifuged egg, at two pronuclei stage. 
<S Centrifuged egg, at once, showing yellow centers in asters. 
T Centrifuged egg, at 2-cell stage. 
U Centrifuged egg, continuously on water centrifuge. 
V Centrifuged egg, at 4-cell stage. 
W Cerebratulus egg, centrifuged at germinal vesicle stage 
X Cerebratulus egg, centrifuged at polar spindle stage. 
