. The eggs of mammals . Fig. 6 Plate IV. Various stages in the development of the mature oocyte. (From the Archives de Biologie.) Fig. 1, First maturation spindle—guinea pig. Fig. 2, Binucleated ovum, chro- mosomes oriented for the metaphase of a mitosis—guinea pig. Fig. 3, Binucleated ovum with formed maturation spindles—mouse. Fig. 4, Multinucleate cytoplasm— mouse. Figs. 5 and 6, Typical uninucleate cleaved ovocytes. Fig. 6 shows deuto- plasmic extrusions—guinea pig. 58

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