PLATE 4 



THE EGG OF THE DOMESTIC CAT 



W. H. LONGLEY 





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EXPLANATION OF FIGURES 



Fig. 12 A reconstruction of two other adjacent .sections of the same egg shown 

 in the preceding figure. The vacuole about tlie si)erni head is probably an artifact 

 produced by shrinkage due to an unusually thin cytoplasm surrounding it. The 

 zona does not appear. X 625. 



Fig. 13 Two cell stage accompanied by a polar body. Note the presence of a 

 conspicuous zona pellucida. X 750. 



172 



