Outer Cfll. 



Polar bodies 



Inner cells. 



Outer cells 



Inner celh 



OvJ^ Cet|. 



Outer cells. 



Fjg 17 Diagrams showing the cleavage of the mammalian (rabbit's) ovum and the formation of the 



blastodermic vesicle (Allen Thomson, after van Beneden). X 200. 



