EMBRYOLOGY OF CRYPTOBRANCHUS 151 



Physiological polyspermy is of normal occurrence. The super- 

 numerary spermatozoa lead but a transient existence. 



Union of the germ-nuclei takes place at a point deeply situated 

 near the center of the blastodisc, and is followed by the segrega- 

 tion of masses of cytoplasm forming a broken layer near its sur- 

 face. 



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