r.a 



T J.kT,-V. . T V ? <**^J#;?SP 



;<-> ;-. > -- - \':. f fef^'rt ^i>^S 

 ^^^^^ v ' r '"-"* v: ^Sv^??^*^ 



&W^^^'^d^&m^ 



^i-^mmm$M 









FIG. 8. Fertilization in the Axolotl. 



A and B, Meridional sections of the whole egg. A, Formation of entrance- 

 funnel (first part of sperm-path). B, Formation of sperm-sphere and aster ; 

 o^ male pronucleus ; $ female pronucleus; p.b., the two polar bodies. 



c, Formation of the sperm-sphere round the middle piece (anterior 

 centrosome) ; parts only of the head (black) and tail are shown. 



D, Formation of the sperm-aster. The centrosome has disappeared ; the 

 head, beginning to be vacuolated, is separated from the tail. 



E, Further shortening and vacuolation of the sperm-nucleus. There is 

 still no centrosome. 



