Abstract
1. Two kinds of spermatogonia, early and Tate, are distinguished morphologically. The giant spermatogonium-like cells are infrequently found in the testis of the Young male. Their significance and destiny are now unexplainable.2. The chromosome number is 42 in diploid and 21 in haploid. The spermatogonial chromosomes are all arranged into 21 homologous pairs, representing no heteromorphic elements in either tetrad or dyad sets.3. The spermatogonial chromosomes are all telomitic rod-shaped, straight or slightly curved, ranging in shape from long rods to short ones. They form the equatorial plate with 21 tetrads of horizontal ring and horse-shoe shape in the primary spermatocyte division. The secondary spermatocyte chromosomes all appear in the form of rods.4. The behavior of the chromosomes during meiosis corresponds to that generally described in other vertebrates. The chromatoid body is traced through the whole meiotic phases.5. Throughout the dividing stages during spermatogenesis the author could not find any particular chromosomes in heterotropic behavior characteristic to the sex chromosome. The sex chromosomes of fish must be in the lowest state of differentiation from the autosomes, as compared with those of other vertebrates.
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