434 



ROBERT W. HEGNER 



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Fig. 15 Moina paradoxa (redrawn from Weismann and Ischikawa, '89). A, 

 egg with substance escaping from germinal vesicle. B, egg containing egg nucleus 

 (e), sperm nucleus (s) and 'Copulationszelle' (C). C, cleavage cell and 'Copula- 

 tionszelle' (c) fusing. D, cleavage cell and 'Copulationszelle' fusing. 



Fig. 16 Cyclops (redrawn from Haecker, '97). A, egg showing 'Aussenkorn- 

 chen' {ak) at one end of first cleavage spindle. B, thirty-two cell stage showing 

 'Aussenkornchen' {ak) in the primordial germ cell {Kz). Rk, polar bodies. 



