Archive image from page 148 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar Year: 1920 Fig. 63. FertiUzation of the egg of Ascaris tmgalocephala bivalens by spermatozoa of A. m. MnlV<l;•ns (After Herla , 1895.) A, approach of the gamete nuclei; B, the chromosomes of the zygote nucleus; C, egg divided into two blastomeres ; D, twelve blastomeres. and Doncaster, 1914) the large chromosomes of Lycia and the smaU ones of Ithysia are distinguishable in the hybrid right up to the formation of its gametes (Fig. 185). The

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Archive image from page 148 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar Year: 1920 Fig. 63. FertiUzation of the egg of Ascaris tmgalocephala bivalens by spermatozoa of A. m. MnlV<l;•ns (After Herla , 1895.) A, approach of the gamete nuclei; B, the chromosomes of the zygote nucleus; C, egg divided into two blastomeres ; D, twelve blastomeres. and Doncaster, 1914) the large chromosomes of Lycia and the smaU ones of Ithysia are distinguishable in the hybrid right up to the formation of its gametes (Fig. 185). The persistence of an unusual number, though not of distinct types, of chromosomes in a hybrid was observed by Herla in 1895. He found five females of Ascaris megalocephala bivalens which had been fertilized by the univalens variety. Consequently the nuclei of their hybrid embr\'os had three chromosomes, two derived from the female and one from the

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