642 Geo. W. TanyreurHer, Germ Cells and early Embryology of certain Aphids. 
Fig. 111—116. Degenerating male cells. 
Fig. 117—119. Ovogonia of the asexual forms, from the beginning 
to the end of growth period. 
Fig. 120. Condition of ovum before the breaking down of the 
germinal vesicle. 
Fig. 121—125. Formation of the polar body. p.b polar body. 
Fig. 126—130. Behavior of pronucleus and first cleavage. 
Lippert & Co. (G. Pätz’sche Buchdr.), Naumburg a. S. 
